LG LMK420YMW Owner’s Manual

USER GUIDE

LM-K420YMW

ENGLISH

MFL71756806 (1.0)

www.lg.com

ENGLISH

About this user guide

Thank you for choosing this LG product. Please carefully read this user guide before using the device for the first time to ensure safe and proper use.

• Always use genuine LG accessories. The supplied items are designed

only for this device and may not be compatible with other devices.

• This device is not suitable for people who have a visual impairment due

to the touchscreen keyboard.

• Descriptions are based on the device default settings.

• Default apps on the device are subject to updates, and support for

these apps may be withdrawn without prior notice. If you have any questions about an app provided with the device, please contact an LG Service Centre. For user-installed apps, please contact the relevant service provider.

• Modifying the device’s operating system or installing software from

unofficial sources may damage the device and lead to data corruption or data loss. Such actions will violate your LG licence agreement and void your warranty.

• Some content and illustrations may differ from your device, depending

on the area, service provider, software version, or OS version, and are subject to change without prior notice.

• Software, audio, wallpaper, images, and other media supplied with

your device are licenced for limited use. If you extract and use these materials for commercial or other purposes, you may be infringing copyright laws. As a user, you are fully responsible for the illegal use of media.

• Additional charges may incur for data services, such as messaging,

uploading, downloading, auto-syncing and location services. To avoid additional charges, select a data plan suitable to your needs. Contact your service provider to obtain additional details.

Instructional notices

WARNING: Situations that could cause injury to the user and third

CAUTION: Situations that may cause minor injury or damage to the

NOTE: Notices or additional information.

parties.

device.

2About this user guide

Table of contents

6 Guidelines for safe and efficient use

Custom-designed Features

16 Camera features

20 Audio recording features

20 Google Assistant

22 Fingerprint recognition

26 Multi-tasking feature

Basic Functions

30 Product components and

accessories

Parts overview

35 Turning the power on or off

36 Installing the SIM card

38 Inserting the memory card

39 Removing the memory card

39 Battery

42 Touch screen

45 Home screen

54 Screen lock

57 Memory card encryption

58 Taking screenshots

59 Content sharing

61 Do not disturb

Useful Apps

63 Installing and uninstalling apps

65 App Shortcuts

66 Phone

70 Messaging

71 Camera

82 Gallery

87 Contacts

89 QuickMemo+

92 Clock

93 Calculator

94 Music

95 ThinQ

95 FM Radio

96 Audio Recorder

96 Game Launcher

97 Smart Doctor

97 LG Mobile Switch

98 App trash

98 RemoteCall Service

98 Cell Broadcast

99 Google apps

Settings

103 Settings

103 Network & internet

110 Connected devices

113 Sound

114 Notifications

115 Display

116 Wallpaper & theme

116 Lock screen & security

118 Privacy

119 Location

119 Extensions

121 Apps

121 Battery

122 Storage

122 Accounts

122 Digital Wellbeing & parental

controls

Google

123

123 System

127 Accessibility

4Table of contents

Appendix

130 LG Language Settings

130 LG Bridge

131 Phone software update

133 Anti-Theft Guide

134 Open Source Software Notice

Information

Regulatory information

134

(Regulation ID number, E-labeling, etc.)

135 Trademarks

136 Laser safety statement

136 DECLARATION OF

CONFORMITY

More information

137

139 FAQ

5Table of contents

Guidelines for safe and efficient use

Please read these simple guidelines. Not following these guidelines may be dangerous or illegal.

Should a fault occur, a software tool is built into your device that will gather a fault log. This tool gathers only data specific to the fault, such as signal strength, cell ID position in sudden call drop and applications loaded. The log is used only to help determine the cause of the fault. These logs are encrypted and can only be accessed by an authorised LG repair centre should you need to return your device for repair.

Exposure to radio frequency energy

Radio wave exposure and Specific Absorption Rate (SAR) information.

This device has been designed to comply with applicable safety requirements for exposure to radio waves. These requirements are based on scientific guidelines that include safety margins designed to assure the safety of all persons, regardless of age and health.

• The radio wave exposure guidelines employ a unit of measurement known

as the Specific Absorption Rate, or SAR. Tests for SAR are conducted using standardised methods with the device transmitting at its highest certified power level in all used frequency bands.

• While there may be differences between the SAR levels of various LG device

models, they are all designed to meet the relevant guidelines for exposure to radio waves.

• The SAR limit recommended by the International Commission on Non-Ionizing

RadiationProtection(ICNIRP)is2W/kgaveragedover10goftissue.

• The highest SAR value for this model tested for use at the ear is 0.606 W/kg

(10g)andwhenwornonthebodyis1.504W/kg(10g).

• This device meets RF exposure guidelines when used either in the normal use

positionagainsttheearorwhenpositionedatleast5mmawayfromthebody.

When a carry case, belt clip or holder is used for body-worn operation, it should

notcontainmetalandshouldpositiontheproductatleast5mmawayfrom

your body. In order to transmit data files or messages, this device requires a quality connection to the network. In some cases, transmission of data files or messages may be delayed until such a connection is available. Ensure the above separation distance instructions are followed until the transmission is completed.

Product care and maintenance

• Use only in-box accessories which are authorised by LG. LG does not guarantee

any damage or failure which is caused by third party accessories.

• Some contents and illustrations may differ from your device without prior

notice.

• Do not disassemble this unit. Take it to a qualified service technician when repair

work is required.

• Repairs under warranty, at LG’s discretion, may include replacement parts

or boards that are either new or reconditioned, provided that they have functionality equal to that of the parts being replaced.

• Keep away from electrical appliances such as TVs, radios and personal

computers.

• The unit should be kept away from heat sources such as radiators or cookers.

• Do not drop.

• Do not subject this unit to mechanical vibration or shock.

• Switch off the device in any area where you are required to by special

regulations. For example, do not use your device in hospitals as it may affect sensitive medical equipment.

• Do not handle the device with wet hands while it is being charged. It may cause

an electric shock and can seriously damage your device.

• Do not charge a handset near flammable material as the handset can become

hot and create a fire hazard.

• Use a dry cloth to clean the exterior of the unit (do not use solvents such as

benzene, thinner or alcohol).

• Do not charge the device when it is on soft furnishings.

• The device should be charged in a well ventilated area.

• Do not subject this unit to excessive smoke or dust.

• Do not keep the device next to credit cards or transport tickets; it can affect the

information on the magnetic strips.

• Do not tap the screen with a sharp object as it may damage the device.

• Do not expose the device to liquid or moisture.

• Use accessories like earphones cautiously. Do not touch the antenna

unnecessarily.

7Guidelines for safe and efficient use

• Do not use, touch or attempt to remove or fix broken, chipped or cracked glass.

Damage to the glass display due to abuse or misuse is not covered under the warranty.

• Your device is an electronic device that generates heat during normal operation.

Extremely prolonged, direct skin contact in the absence of adequate ventilation may result in discomfort or minor burns. Therefore, use care when handling your device during or immediately after operation.

• If your device gets wet, immediately unplug it to dry off completely. Do not

attempt to accelerate the drying process with an external heating source, such as an oven, microwave or hair dryer.

• The liquid in your wet device, changes the colour of the product label inside your

device. Damage to your device as a result of exposure to liquid is not covered under your warranty.

• A mobile device requires proper air circulation in order to dissipate heat. Direct skin

contact and inadequate circulation of air flow to the device may cause the device to overheat. The device must be at least 1.0cm from between the user’s body.

• Prevent dust of any other foreign substances from getting into the Charger/

USB cable port. It may cause heat or fire.

• Avoid exposing the device to low air pressure at high altitude.

• Do not expose the device to extremely low air pressure. Otherwise, it can cause

explosion of the battery or leakage of flammable liquid or gas.

• Please ensure that the product does not get in contact with liquid. Do not use

or recharge the product if it is wet. Once the product becomes wet, the liquid damage indicator changes colour. Please note that this will limit you from receiving any free-of-charge repair services provided under warranty.

8Guidelines for safe and efficient use

Efficient device operation

Electronics devices

All devices may receive interference, which could affect performance.

• Do not use your device near medical equipment without requesting permission.

Please consult your doctor to determine if operation of your device may interfere with the operation of your medical device.

•

Pacemakermanufacturersrecommendthatyouleaveatleast15cmofspace

between other devices and a pacemaker to avoid potential interference with the pacemaker.

• This device may produce a bright or flashing light.

• Some hearing aids might be disturbed by devices.

• Minor interference may affect TVs, radios, PCs etc.

Useyourdeviceintemperaturesbetween0ºCand40ºC,ifpossible.Exposing

•

your device to extremely low or high temperatures may result in damage, malfunction, or even explosion.

Road safety

Check the laws and regulations on the use of devices in the area when you drive.

• Do not use a hand-held device while driving.

• Give full attention to driving.

• Pull off the road and park before making or answering a call if driving conditions

so require.

• RF energy may affect some electronic systems in your vehicle such as car

stereos and safety equipment.

• When your vehicle is equipped with an air bag, do not obstruct with installed

or portable wireless equipment. It can cause the air bag to fail or cause serious injury due to improper performance.

• If you are listening to music whilst out and about, please ensure that the volume

is at a reasonable level so that you are aware of your surroundings. This is of particular importance when near roads.

9Guidelines for safe and efficient use

Avoid damage to your hearing

To prevent possible hearing damage, do not listen at high volume levels for long periods.

Damage to your hearing can occur if you are exposed to loud sound for long periods of time. We therefore recommend that you do not turn on or off the handset close to your ear. We also recommend that music and call volumes are set to a reasonable level.

• When using headphones, turn the volume down if you cannot hear the people

speaking near you, or if the person sitting next to you can hear what you are listening to.

• Excessive sound pressure from earphones and headphones can cause

hearing loss.

Glass Parts

Some parts of your device are made of glass. This glass could break if your device is dropped on a hard surface or receives a substantial impact. If the glass breaks, do not touch or attempt to remove it. Stop using your device until the glass is replaced by an authorised service provider.

Blasting area

Do not use the device where blasting is in progress. Observe restrictions and follow any regulations or rules.

Potentially explosive atmospheres

• Do not use your device at a refueling point.

• Do not use near fuel or chemicals.

• Do not transport or store flammable gas, liquid or explosives in the same

compartment of your vehicle as your device or accessories.

10Guidelines for safe and efficient use

In aircraft

Wireless devices can cause interference in aircraft.

• Turn your device off before boarding any aircraft.

• Do not use it on the ground without permission from the crew.

Children

Keep the device in a safe place out of the reach of small children. It includes small parts which may cause a choking hazard if detached.

Emergency calls

Emergency calls may not be available on all mobile networks. Therefore you should never depend solely on your device for emergency calls. Check with your local service provider for more information.

Use your mobile phone to call emergency services for yourself or others in the case of fire, traffic accident or medical emergencies;

• Australia Dial (0-0-0)

• New Zealand Dial (1-1-1)

• International Dial (1-1-2)

Remember, it is a free call when dialling emergency services from your mobile phone in Australia.

Notice for Battery replacement

• For your safety, do not remove the battery incorporated in the product.

If you need to replace the battery, take it to the nearest authorised LG Electronics service point or dealer for assistance.

• Li-Ion Battery is a hazardous component which can cause injury.

• Battery replacement by a non-qualified professional can cause damage

to your device.

11Guidelines for safe and efficient use

Battery information and care

• You do not need to completely discharge the battery before recharging. Unlike

other battery systems, there is no memory effect that could compromise the battery’s performance.

• Use only LG batteries and chargers. LG chargers are designed to maximise the

battery life.

• Do not disassemble or short-circuit the battery.

• Keep the metal contacts of the battery clean.

• Replace the battery when it no longer provides acceptable performance. The

battery pack may be recharged hundreds of times before it needs replacing.

• Recharge the battery if it has not been used for a long time to maximise

usability.

• Do not expose the battery charger to direct sunlight or use it in high humidity,

such as in the bathroom.

• Do not leave the battery in hot or cold places, as this may deteriorate battery

performance.

• Risk of explosion if battery is replaced by an incorrect type. Dispose of used

batteries according to the instructions.

• If you need to replace the battery, take it to the nearest authorised LG

Electronics service point or dealer for assistance.

• Always unplug the charger from the wall socket after the device is fully charged

to save unnecessary power consumption of the charger.

• Actual battery life will depend on network configuration, product settings,

usage patterns, battery and environmental conditions.

• Make sure that no sharp-edged items such as animal’s teeth or claws, come

into contact with the battery. This could cause a fire.

12Guidelines for safe and efficient use

Driver Safety Tips

Your mobile telephone gives you the powerful ability to communicate almost anywhere, anytime, but an important responsibility accompanies the benefits of mobile phones, one that every user must uphold.

When driving a car, driving is your first responsibility. When using your mobile phone behind the wheel of a car, practice good common sense and remember the following tips:

• Use a hands free device to add an additional layer of convenience and safety to

your wireless phone.

• Let the person you are speaking with know you are driving; if necessary,

suspend the call in heavy traffic or hazardous weather conditions. Rain, sleet, snow, ice and even heavy traffic can be hazardous.

• Do not take notes or look up phone numbers while driving. Typing up a “to

do” list or flipping through your address book takes attention away from your primary responsibility of driving safely.

• Place calls when you are not moving or before pulling into traffic. Try to plan

calls when you will not be driving.

• Do not engage in stressful or emotional conversations that may be distracting.

Make people you are talking with aware you are driving and suspend conversations that have the potential to divert your attention from the road.

• Use your mobile phone to help others in emergencies. If you see an auto

accident, crime in progress or other serious emergency where lives are in danger, call the emergency number, as you would want others to do for you.

• If you see a broken down vehicle posing no serious hazard, a broken traffic

signal, a minor traffic accident where no one appears injured, or a vehicle you know to be stolen, call roadside assistance, local traffic authority or police station.

13Guidelines for safe and efficient use

Securing personal information

• Make sure to protect your personal information to prevent data leakage or

misuse of sensitive information.

• Always back up important data while using the device. LG is not responsible for

any data loss.

• Make sure to back up all data and reset the device when disposing of the device

to prevent any misuse of sensitive information.

• Read the permission screen carefully while downloading applications.

• Be cautious using the applications that have access to multiple functions or to

your personal information.

• Check your personal accounts regularly. If you find any sign of misuse of your

personal information, ask your service provider to delete or change your account information.

• If your device is lost or stolen, change the password of your account to secure

your personal information.

• Do not use applications from unknown sources.

14Guidelines for safe and efficient use

Custom-designed Features

Camera features

Wide-angle camera

You can take photos or record videos with a wider range than your actual field of vision by using the wide-angle on the rear camera.

, then tap / to switch between the standard and wide-

Tap angle.

Change the camera angle.

Rear Camera

• See

Gallery overview

• You can switch between the standard and wide-angle camera lenses on

the rear camera only.

for details.

Custom-designed Features 16

Portrait

You can take a sharp portrait by applying the camera lens blur effect.

Tap , then tap Portrait.

Tap to take a photo.

• To adjust blur strength, drag the slide bar to the left or right.

• Keep the distance to your subject within 1.3 ~ 5.0 feet when using the

rear camera.

• This feature is not available if the surroundings are too dark.

• After applying this feature, tap the desired position on the preview

screen to automatically apply the exposure value and focus when using the rear camera, or exposure value only when using the front camera.

Custom-designed Features 17

AI CAM

You can effectively take photos or record videos since the camera recognises the object when taking a photo or recording a video.

Tap , then tap AI CAM.

When the object is recognised, the best effect for the scene is applied.

• To apply other effects, tap the scene icon.

• Pet, city, flower, food, landscape, person, sunset, auto, total 8

categories can be recognised automatically.

Sunset Flower

• The result of the scene recognition may differ depending on the

illumination or the location of the subject while taking photos. Keywords do not appear on the actual photos or videos.

• This feature is available only when the front and rear cameras are in the

specific mode.

Custom-designed Features 18

Sticker

Set timer settingSet camera

You can apply a variety of stickers to your photos or videos. You can create richer content by using 3D AR Effect.

Tap and select Sticker by swiping camera modes.

• Select a desired sticker by swiping stickers.

Tap to take a photo, or tap and hold to record a video.

• The front and rear cameras cannot be switched while recording a

video.

Tap to end the video recording.

• The photo or video will be saved in Gallery.

Choose screen ratio

Custom-designed Features 19

Audio recording features

LG 3D Sound Engine

LG 3D Sound Engine feature allows you to hear stereoscopic and optimised sound. When playing music or video, you can enjoy stereoscopic and immersive sound as if you were listening in the field.

Drag the notifications panel downwards.

Tap to turn on or off the LG 3D Sound Engine feature.

Or tap Settings Sound Sound quality and effects LG 3D Sound Engine and tap

• If you connect an external audio device such as an earphone or speaker

to the product, a pop-up appears to turn on the LG 3D Sound Engine feature.

to activate it.

Google Assistant

Google Assistant overview

Your device has the built-in Google Assistant feature. Find answers and get things done while on-the-go.

• To use this feature, first connect to the network.

Launching Google Assistant

Press the Google Assistant key on the left side of the device.

or Swipe diagonally from a bottom edge corner of the screen.

Tap GET STARTED.

Custom-designed Features 20

Follow the on-screen instructions.

• The device saves your voice data for recognition.

Set whether to use the voice match unlock function.

• If you use the voice match unlock function, you can unlock the

device even when the device screen is turned off or the device is charging by saying “OK Google” or “Hey Google”.

• This feature may increase security vulnerabilities compared to other

screen locks, such as Pattern, PIN, and Password. When a similar voice or your recorded voice is used, the screen may be unlocked.

• To use this feature, on the home screen, tap Settings

& security

screen lock method you set to unlock the device.

• You need to unlock the device by using the specified method if you fail to

unlock the device with voice recognition. See

Tap Finish.

Secure lock settings Smart Lock, and then use the

Setting a screen lock

Lock screen

Accessing by Voice

When the home screen is turned off or locked, say “OK Google” or

“Hey Google”.

When the Google Assistant screen appears, say a command or ask a

question.

Accessing from Home Screen

Press the Google Assistant key on the left side of the device.

or Swipe diagonally from a bottom edge corner of the screen.

Say a command or question when you see on the bottom of the

screen.

for details.

Custom-designed Features 21

• In an environment where Wi-Fi or mobile data connection is poor, the

Google Assistant function may be restricted and the speech recognition accuracy rate may be lowered.

• If the speech is ambiguous, the microphone is covered, a media player is

playing, or the surrounding is loud, the speech recognition accuracy rate may be lowered. When you are using the product via voice commands, say with accurate pronunciation in a quite environment for better speech recognition accuracy.

Fingerprint recognition

Fingerprint recognition overview

You must register your fingerprint on your device first before using the fingerprint recognition function.

You can use the fingerprint recognition function in the following cases:

• To unlock the screen.

• To view the locked content in the Gallery or QuickMemo+.

• Confirm a purchase by signing into an app or identifying yourself with

your fingerprint.

• You can use fingerprint data for user authentication. There is a

possibility that the fingerprint sensor might recognise a different but very similar fingerprint as the same registered fingerprint. To strengthen security, it is recommended that you use the pattern, PIN, or password method for unlocking the screen.

• If the device cannot detect your fingerprint or you forgot the value

specified for registration, visit the nearest LG Customer Service Centre with your device and ID card.

Custom-designed Features 22

Precautions for fingerprint recognition

Fingerprint recognition accuracy may decrease due to a number of reasons. To maximise the recognition accuracy, check the following before using the device.

• At the bottom centre of the product’s screen, there is a built-in sensor

that recognises fingerprints. Be careful not to scratch or damage the fingerprint sensor with metal objects such as coins or keys.

• If there are foreign substances (sweat, lotion, water, dirt, grease, etc.)

on the fingerprint sensor or on the finger to be put on the sensor, fingerprint recognition may not work properly. Wipe the sensor and the finger clean and remove all moisture before putting the finger on the sensor.

• If the finger’s surface is rough due to it being scarred or pruney from

water, the sensor may not be able to recognise the fingerprint. In such a case, register another fingerprint.

• If you bend your finger or use the fingertip only, your fingerprint may

not be recognised. Make sure that your finger covers the entire surface of the fingerprint sensor.

• Scan only one finger for each registration. Scanning more than one

finger may affect fingerprint registration and recognition.

• The device may generate static electricity if the surrounding air is dry.

If the surrounding air is dry, avoid scanning fingerprints, or touch a metallic object such as a coin or a key before scanning fingerprints to remove static electricity.

Custom-designed Features 23

Registering fingerprints

You can register and save your fingerprint on the device to use fingerprint identification.

On the home screen, tap Settings Lock screen & security

Fingerprints.

• A lock screen must be set be able to use this feature.

• If the screen lock is not active, configure the lock screen by following the

on-screen instructions. See

Place your finger on the fingerprint sensor on the device and adjust it

little by little.

• Gently press the fingerprint sensor so that the sensor can recognise

your fingerprint.

• Ensure that your finger covers the entire surface of the fingerprint

sensor.

Setting a screen lock

for details.

Follow the on-screen instructions.

• Until the fingerprint registration is completed, move the same finger

around on the sensor little by little.

• Put the finger on the sensor. When you feel a vibration, remove the

finger from the sensor.

Custom-designed Features 24

When the fingerprint registration is done, tap OK.

• Tap Add more to register another fingerprint. Since the fingerprint

recognition success rate depends on the condition of the registered fingerprint, it is recommended that you register several different fingerprints.

Managing fingerprints

You can edit or delete registered fingerprints.

On the home screen, tap Settings Lock screen & security

Fingerprints.

Unlock according to the specified lock method.

From the fingerprint list, tap a fingerprint to rename it. To delete it, tap

Unlocking the screen with a fingerprint

You can unlock the screen or view the locked content by using your fingerprint. Activate the desired function:

On the home screen, tap Settings Lock screen & security

Fingerprints.

Unlock according to the specified lock method.

On the fingerprint settings screen, activate the desired function:

• Screen lock: Unlock screen with a fingerprint.

• Content lock: Unlock content with a fingerprint. To do this, make

sure that the content lock is set.

Custom-designed Features 25

Multi-tasking feature

Recent Uses Screen

Swipe the Home button upward and hold to view the recent use history.

Pop-up window

You can open multiple apps on the screen and easily switch between them at any time.

Swipe up on from the bottom of the screen.

Tap the app icon on the top left of the app screen and select Pop-up

window.

• If you tap the app icon, the App info, Multi window, Pop-up

window and Pin app options appear.

The app appears in the form of a pop-up window on the screen.

• This feature may not be available in some apps or screens.

Custom-designed Features 26

Using the pop-up window

• : Minimises the pop-up window. The pop-up window is minimised

into the app icon floating on the screen, which can be moved anywhere you want.

: Expands the app to full screen.

•

: Closes the app.

•

• You can open up to 5 apps using the pop-up windows.

• To select an app from the opened apps, tap one of the pop-up windows.

The selected pop-up window comes to the front.

• Pop-up windows cannot be moved to the status bar or navigation bar

area.

Using the app folder for pop-up windows

If you tap on the pop-up window, the pop-up window is minimised into the app icon.

You can move the app icon anywhere you want by dragging it. If two or more pop-up windows are minimised, the app folder is created to

contain the app icons.

• The recently-used app icon is used as the app folder icon. If you tab the

icon, all the icons for the minimised pop-up windows appear in the app folder.

• If you touch and hold the app folder for pop-up windows and drag the

app folder into Remove, the app folder will be removed.

• To remove one of the apps from the app folder, open the app folder and

drag the app icon out of the app folder.

Custom-designed Features 27

Multi window

When using gesture navigation

Swipe up on from the bottom of the screen.

• Recently-used apps appear.

• If you tap the app icon, the App info, Multi window, Pop-up

window and Pin app options appear.

Tap the app icon on the top left of the app to be displayed in the

multiwindow and select Multi window.

• The selected app appears at the top half of the screen.

Tap the other app to be displayed in the multi window.

• The selected app appears at the bottom half of the screen.

When using Buttons only navigation

Tap on the navigation bar.

• Recently-used apps appear.

• If you tap the app icon, the App info, Multi window, Pop-up

window and Pin app options appear.

Tap the app icon on the top left of the app to be displayed in the

multiwindow and select

• The selected app appears at the top half of the screen.

Tap the other app to be displayed in the multi window.

• To adjust the size of the split screen, drag the bar on the centre of the

screen.

• To deactivate the multi window feature, drag the centre bar up or down

to the end of the screen.

• The multi window feature is not supported in some LG apps or apps

downloaded from the Play Store.

Custom-designed Features 28

Basic Functions

+ 114 hidden pages