LG LMK420YM Owner’s Manual

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USER GUIDE

LM-K420YM

MFL71756201 (1.0)

www.lg.com

About this user guide

ENGLISH

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.

•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•Default apps on the device are subject to updates, and support for these apps may be withdrawn without prior notice.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 parties.

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

NOTE: Notices or additional information.

About this user guide

Table of contents

6 Guidelines for safe and efficient use

Custom-designed Features

14 Camera features

18 Audio recording features

18 Google Assistant

20 Fingerprint recognition

24 Multi-tasking feature

Basic Functions

28Product components and accessories

29Parts overview

33Turning the power on or off

34Installing the SIM card

36Inserting the memory card

37Removing the memory card

37Battery

40Touch screen

43Home screen

51Screen lock

54Memory card encryption

55Taking screenshots

56Content sharing

57Do not disturb


03		04

Useful Apps		Settings
60	Installing and uninstalling apps	95	Settings
61	App Shortcuts	95	Network & internet
62	Phone	101	Connected devices
66	Messaging	103	Sound
67	Camera	105	Notifications
77	Gallery	105	Display
81	Contacts	106	Wallpaper & theme
84	QuickMemo+	106	Lock screen & security
86	Clock	108	Privacy
87	Calculator	109	Location
87	Music	109	Extensions
88	ThinQ	111	Apps
89	Audio Recorder	111	Battery
89	Game Launcher	112	Storage
90	Smart Doctor	112	Accounts
90	LG Mobile Switch	112	Digital Wellbeing & parental
90	App trash		controls
91	RemoteCall Service	113	Google
91	Cell Broadcast	113	System
91	Google apps	116	Accessibility

Table of contents

Appendix

120LG Language Settings

120LG Bridge

121Phone software update

123Anti-Theft Guide

124Open Source Software Notice Information

124Regulatory information (Regulation ID number, E-labeling, etc.)

125Trademarks

126Laser safety statement

126DECLARATION OF CONFORMITY

127More information

129FAQ

Table 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

RadiationProtection(ICNIRP)is2 W/kgaveragedover10 goftissue.

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

(10 g)andwhenwornonthebodyis1.504 W/kg(10 g).

•This device meets RF exposure guidelines when used either in the normal use positionagainsttheearorwhenpositionedatleast5mmawayfromthebody.

When a carry case, belt clip or holder is used for body-worn operation, it should notcontainmetalandshouldpositiontheproductatleast5mmawayfrom 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.

Guidelines 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.

Guidelines 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.

•Pacemakermanufacturersrecommendthatyouleaveatleast15cmofspace 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.

•Useyourdeviceintemperaturesbetween0 ºCand40 ºC,ifpossible.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.

Guidelines 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.

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.

Guidelines for safe and efficient use

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.

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.

Guidelines 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.

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.

Guidelines 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.

Tap , then tap / to switch between the standard and wideangle.

Change the camera angle.

Rear Camera

• See Gallery overview for details.

•You can switch between the standard and wide-angle camera lenses on the rear camera only.

Custom-designed Features

Portrait

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

1Tap , then tap Portrait.

2Tap to take a photo.

• 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

AI CAM

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

1Tap , then tap AI CAM.

2When 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 AI mode.

Custom-designed Features

Sticker

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

1Tap and select Sticker by swiping camera modes.

•Select a desired sticker by swiping stickers.

2Tap to take a photo, or tap and hold to record a video.

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

3Tap to end the video recording.

•The photo or video will be saved in Gallery.

Set camera				Set timer setting

Choose screen ratio

Custom-designed Features

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.

1Drag the notifications panel downwards.

2Tap Settings Sound Sound quality and effects LG 3D Sound Engine and tap to activate it.

• 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.

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

1Press the Google Assistant key on the left side of the device. or

Swipe diagonally from a bottom edge corner of the screen.

2Tap GET STARTED.

3Follow the on-screen instructions.

Custom-designed Features

• The device saves your voice data for recognition.

4Set 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 be more vulnerable to security than the 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 Lock screen & security Secure lock settings Smart Lock, and then use the 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 Setting a screen lock for details.

5 Tap Finish.

Accessing by Voice

1When the home screen is turned off or locked, say “OK Google” or

“Hey Google”.

2When the Google Assistant screen appears, say a command or ask a question.

Accessing from Home Screen

1Press the Google Assistant key on the left side of the device. or

Swipe diagonally from a bottom edge corner of the screen.

2Say a command or question when you see on the bottom of the screen.

Custom-designed Features

• 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 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

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

Registering fingerprints

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

1On the home screen, tap Settings Lock screen & security Fingerprints.

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

•If the screen lock is not active, configure the lock screen by following the on-screen instructions. See Setting a screen lock for details.

2Place 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.

3Follow 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

4When 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.

1On the home screen, tap Settings Lock screen & security Fingerprints.

2Unlock according to the specified lock method.

3From 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:

1On the home screen, tap Settings Lock screen & security Fingerprints.

2Unlock according to the specified lock method.

3On 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.

•Screen unlock when screen is off: Unlock screen even when the screen is off by placing your finger on the Power key.

Custom-designed Features

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.

1Swipe up on from the bottom of the screen.

2Tap 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.

3The 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

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

Multi window

When using gesture navigation

1Swipe 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.

2Tap 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.

3Tap 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

1Tap 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.

2Tap 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.

3Tap 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

Basic Functions

Product components and accessories

The following items are included with your device.

•	Device	•	Charger
•	USB cable	•	Quick Start Guide

•Ejection pin

•The items described above may be optional.

•The items supplied with the device and any available accessories may vary depending on the area and service provider.

•Always use genuine LG Electronics accessories. Using accessories made by other manufacturers may affect your device's call performance or cause malfunctions. This may not be covered by LG's repair service.

•Some of the device parts are made of tempered glass. If you drop your device on a hard surface or subject it to severe impact, the tempered glass may be damaged. If this happens, stop using your device immediately and contact an LG Customer Service Centre.

• If any of these basic items are missing, contact the dealer from which you purchased your device.

•To purchase additional items, contact an LG Customer Service Centre.

•Some items in the product box are subject to change without notice.

•The appearance and specifications of your device are subject to change without prior notice for product improvement.

•Device specifications may vary depending on the area or service provider.

•Remove the protective film from the Fingerprint sensor before using the fingerprint recognition feature.

Basic Functions