Table Index ........................................................................................................................................ 6
Figure Index ...................................................................................................................................... 7
Revision History ................................................................................................................................ 8
A. Reference Design ...................................................................................................................... 49
B. Coding Schemes and Maximum Net Data Rates over Air Interface......................................... 50
C. Related Documents ................................................................................................................... 52
D. Terms and Abbreviations .......................................................................................................... 54
E. Safety Caution ........................................................................................................................... 56
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Table Index
Table 1: SIM7500 series frequency bands ........................................................................................................... 9
Table 2: General features ................................................................................................................................... 10
Table 16: NETLIGHT pin status ........................................................................................................................ 32
Table 17: Pin definition of the STATUS ............................................................................................................ 32
Table 18: Pin multiplex function list .................................................................................................................. 33
Table 19: Sink current electronic characteristic ................................................................................................. 33
Figure 9: Power on timing sequence .................................................................................................................. 21
Figure 10: Power off timing sequence ............................................................................................................... 22
Can be used as the AT commands or data stream channel.
Support RTS/CTS hardware handshake
Multiplex ability according to GSM 07.10 Multiplexer Protocol.
USB USB 2.0 specification-compliant as a peripheral
Firmware upgrade USB
Physical characteristics
Firmware upgrade over USB interface
USB 2.0 specification-compliant as a peripheral
Weigh t: 4.0 g
Size:24*27*2.75mm
Normal operation temperature: -30°C to +80°C
Temperature range
Extended operation temperature: -40°C to +85°C*
Storage temperature -45°C to +90°C
*Note: Module is able to make and receive voice calls, data calls, SMS and make
WCDMA/HSPA+/LTE traffic in -40℃ ~ +85℃. The performance will be reduced slightly from
the 3GPP specifications if the temperature is outside the normal operating temperature range
and still within the extreme operating temperature range.
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2 Package Information
2.1 Pin Assignment Overview
All functions of the SIM7500 series will be provided through 56 pads that will be connected to the
customers’ platform. The following Figure is a high-level view of the pin assignment of the
SIM7500 series.
DBG_TXD
GND
56
55
GNSS_ANT
GND
54
GND
53
NETLIGHT
51
52
50
STATUS
GPIO_49
48
49
GPIO_37
GND
47
GND
46
45
MAIN_ANT
GND
44
16
GND
18
17
PCM_CLK
I2S_MCLK
19
PCM_SYNC
20
PCM_IN
22
21
GND
PCM_OUT
24
23
L11_1V8
RESET
25
ADC
26
GPIO_1
27
ISINK
28
GND
Figure 2: Pin assignment overview
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Table 3: Pin Definitions
Pin No. Pin Name Pin No.Pin Name
1 GND 2 DIV_ANT
3 GND 4 SCL
5 SDA 6 GND
7 USB_DM 8 USB_DP
9 VBUS 10 USIM_DATA
11 USIM_CLK 12 USIM_DET
13 USIM_RST 14 USIM_VDD
15 GND 16 GND
17 MCLK 18 PCM_CLK
19 PCM_SYNC 20 PCM_IN
21 PCM_OUT 22 GND
23 L11_1V8 24 RESET
25 ADC 26 GPIO_1
27 ISINK 28 GND
29 GND 30 PWRKEY
31 GND 32 GND
33 VBAT 34 VBAT
35 GND 36 RTS
37 DCD 38 TXD
39 RXD 40 DTR
41 CTS 42 RI
43 GND 44 GND
45 MAIN_ANT 46 GND
47 GND 48* GPIO_37
49 GPIO_49 50 STATUS
51 DBG_TXD 52 NETLIGHT
53 GND 54 GND
55 GNSS_ANT 56 GND
*Note: SIM7500V could not support GNSS Function.
Before the normal power up, pin48 cannot be pulled up.
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2.2 Pin Description
Table 4: IO parameters definition
Pin type Description
PI Power input
PO Power output
AI Analog input
AIO Analog input/output
I/O Bidirectional input /output
DI Digital input
DO Digital output
DOH Digital output with high level
DOL Digital output with low level
PU Pull up
PD Pull down
Table 5: Pin description
Pin name Pin No.
Default
status
Power Supply
VBAT
33,34 PI
L11_1V8 23 PO
1, 3, 6,
15,16,22
,28,29,3
GND
1,32,35,
Ground
43,44,46
,47,53,5
4,56
System Control
PWRKEY 30 DI,PU
RESET 24 DI, PU
USIM interface
Description Comment
Power supply, voltage range: 3.4~
4.2V.
1.8V output with Max. 50Ma
current output for external circuit,
If unused, keep it
open.
such as level shift circuit.
System power on/off control input,
active low.
Default 0.8V
RESET has been
System reset control input, active
low.
pulled up to 1.8V
via a resistor
internally.
USIM Card data I/O, which has
USIM_DATA 10 I/O,PU
been pulled up via a 100KR resistor
to USIM_VDD internally.
USIM_RST 13 DO USIM Reset
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All lines of USIM
interface should
be protected
against ESD.
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USIM_CLK 11 DO USIM clock
Power output for USIM card, its
USIM_VDD 14 PO
output Voltage depends on USIM
card type automatically. Its output
current is up to 50Ma.
USB
VBUS 9 DI,PD
USB_DM 7 I/O
USB_DP
8 I/O
Valid USB detection input with
3.6~5.85V detection voltage
Negative line of the differential,
bi-directional USB signal.
Positiveline of the differential,
bi-directional USB signal.
UART interface
RTS 36 DOH Request to send
CTS 41 DI,PU Clear to Send
RXD 39 DI,PU Receive Data
RI 42 DOH Ring Indicator
DCD 37 DOH Carrier detects
TXD 38 DOH Transmit Data
DTR 40 DI,PU DTE get ready
I2C interface
SCL 4 DO I2C clock output
SDA 5 I/O I2C data input/output
PCM interface
If unused, keep
them open.
If unused, keep
them open.
PCM_OUT 21 DO PCM data output.
PCM_IN 20 DI PCM data input.
PCM_SYNC 19 DO PCM data frame sync signal.
PCM_CLK 18 DO PCM data bit clock.
MCLK 17 DO Audio Master clock
GPIO
NETLIGHT 52 DO
LED control output as network
status indication.
Operating status output.
STATUS 50 DO
High level: Power on and firmware
ready
Low level: Power off
GPIO_1 26 IO GPIO
GPIO_49 49 IO GPIO
Default: GPIO
Optional: USIM card detecting
USIM_DET 12 IO
input.
H: USIM is removed
L: USIM is inserted
GPIO_37 48 IO GPIO
If unused, please
keep them open.
If unused, please
keep them open.
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RF interface
MAIN _ANT 45 AIO MAIN antenna soldering pad
DIV_ANT 2 AI Auxiliary antenna soldering pad
NC 55 AI
Other interface
ISINK 27 AI Ground-referenced current sink.
DGB_TXD 51 DO Use for debug
ADC 25 AI Analog-digital converter input
2.3 Mechanical Information
The following figure shows the package outline drawing of Module.
If unused, please
keep them open.
Figure 3: Dimensions (Unit: mm)
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2.4 Footprint Recommendation
Figure 4: Footprint recommendation (Unit: mm)
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3 Interface Application
3.1 Power Supply
On VBAT pads, a ripple current up to 2A typically, may cause voltage drop. Therefore, the power
supply for these pads must be able to provide sufficient current up to more than 2A in order to
avoid the voltage drop of more than 300mV.
Table 6: VBAT Pins electronic characteristic
Symbol Description Min.Typ. Max. Unit
VBAT Module power voltage 3.4 3.8 4.2 V
I
VBAT(peak)
I
VBAT(average)
I
VBAT(sleep)
I
VBAT(power-off)
Module power peak current in normal mode. 1.0 - 2 A
Module power average current in normal mode
Please refer to the table 34
Power supply current in sleep mode
Module power current in power off mode. - - 20 uA
3.1.1 Power supply Design Guide
Make sure that the voltage on the VBAT pins will never drop below 3.4V.
Note: If the power supply for BAT pins can support up to 2A, using a total of more than 220uF
capacitors is recommended, or else users must use a total of 1000uF capacitors, in order to avoid
the voltage drop of more than 300mV.
Some multi-layer ceramic chip (MLCC) capacitors (0.1/1uF) with low ESR in high frequency band
can be used for EMC.
These capacitors should be put as close as possible to VBAT pads. Also, user should keep VBAT
trace on the circuit board wider than 2 mm to minimize PCB trace impedance. The following figure
shows the recommended circuit.
Figure 5: Power supply application circuit
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In addition, in order to guard over voltage protection, it is suggested to use a zener diode with 5.1V
reverse zener voltage and more than 500mW power dissipation.
Table 7: Recommended zener diode list
No. Manufacturer Part Number power dissipation Package
1 On semi MMSZ5231BT1G 500mW SOD123
2 Prisemi PZ3D4V2H 500mW SOD323
3 Vishay MMSZ4689-V 500mW SOD123
4 Crownpo CDZ55C5V1SM 500mW 0805
3.1.2 Recommended Power Supply Circuit
It is recommended that a switching modepower supply or linear regulator power supply is used. It
is important to make sure that all the components used in the power supply circuit can resist a peak
current up to 2A.
The following figure shows the linear regulatorreference circuit with 5V input and 3.8V output.
Figure 6: Linear regulator reference circuit
If there is a big voltage difference between input and output for VBAT power supply, orthe
efficiency is extremely important,then a switching mode power supply will be preferable. The
following figure shows theswitching mode power supply reference circuit.
Users should connect antennas to Module’s antenna pads through the micro-strip line or other types
of RF trace. The trace impedance must be controlled in 50Ω. SIMCom recommends that the total
insertion loss between Module and antenna should meet the following requirements:
Table 24: Trace Loss
Frequency Loss
700MHz-960MHz <0.5dB
1710MHz-2170MHz <0.9dB
2300MHz-2650MHz <1.2dB
To facilitate the antenna tuning and certification test, a RF connector and an antenna matching
circuit should be added. The following figure is the recommended circuit.
SIM7500V provides LTE antenna named MAIN_ANT, customer could use 50Ω microstrip
line or stripline antenna connect to the module.
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The maximum gain of the Main antenna gain should not exceed 3.49dBi for LTE Band 4
and 2.2dBi for LTE Band 13 considering the SAR radio. It has according to reference trace
and matching circuit testing all FCC items, and all items satisfy FCC requirements. Only
the reference trace and matching circuit is certified,antenna design must refer to it, any
other deviations require testing Class II applications as required by FCC.
The certified matching circuit as following:
Figure 27: Antenna matching circuit (MAIN_ANT)
In above figure, the components R1,C1,C2 and R2 are used for antenna matching, the value of
components can only be achieved after the antenna tuning and usually provided by antenna vendor.
By default, the R1, R2 are 0Ω resistors, and the C1, C2 are reserved for tuning. The component D1
is a TVS for ESD protection, and it is optional for users according to application environment.
The RF test connector is used for the conducted RF performance test, and should be placed as close
as to the module’s MAIN_ANT pin. The traces impedance between Module and antenna must be
controlled in 50Ω.
Figure 28: Antenna matching circuit (DIV_ANT)
In above figure, R3, C3, C4 and R4 are used for auxiliary antenna matching. By default, the R3, R4
are 0Ωresistors, and the C3, C4 are reserved for tuning. D2 is a TVS for ESD protection, and it is
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optional for users according to application environment.
Two TVS are recommended in the table below.
Table 25: Recommended TVS
Package Part Number Vender
0201LXES03AAA1-154Murata
0402LXES15AAA1-153Murata
Note:SIMCom suggests the LTE auxiliary antenna to be kept on, since there are many high
bands in the designing of FDD-LTE. Because of the high insert loss of the RF cable and layout
lines, the receiver sensitivity of these bands above will have risk to meet the authentication
without the diversity antenna.For more details about auxiliary antenna design notice,please
refer to document [25]
4.3 Dipole Antenna PCB Layout Requirements
4.4 Dipole Antenna Reference Design PCB
Mount these devices with brown mark facing up. Units: mm
Line width should be designed to provide 50Ωimpedance matching characteristics.
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LAYER1 - TOP
LAYER2 – BOTTOM
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5 Electrical Specifications
5.1 Absolute Maximum Ratings
Absolute maximumrating for digital and analog pins of Module are listed in the following table:
Table 26: Absolute maximum ratings
Parameter Min. Max. Unit
Voltage at VBAT -0.5 6.0 V
Voltage at VBUS -0.5 6.3 V
Voltage at digital pins (RESET,SPI,GPIO,I2C,UART,PCM) -0.3 2.1 V
Voltage at digital pins :USIM -0.3 3.05 V
Voltage at PWRKEY -0.3 1.8
5.2 Operating Conditions
Table 27: Recommended operating ratings
Parameter Min. Ty p. Max. Unit
Voltage at VBAT 3.4 3.8 4.2 V
Voltage at VBUS 3.6 5 5.25 V
Table 28: 1.8V Digital I/O characteristics*
Parameter Description Min. Typ. Max. Unit
VIH High-level input voltage
VIL Low-level input voltage
VOH High-level output voltage
VOL Low-level output voltage
IOH
IOL
High-level output current(no
pull down resistor)
Low-level output current(no pull
up resistor)
1.17 1.8 2.1 V
-0.3 0 0.63 V
1.35 - 1.8 V
0 - 0.45 V
- 2 mA
- -2 - mA
IIH
IIL
*Note: These parameters are for digital interface pins, such as SPI, GPIOs (NETLIGHT), I2C,
UART, PCM.
The operating temperature of Module is listed in the following table.
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Input high leakage current (no
pull down resistor)
Input low leakage current(no
pull up resistor)
- - 1 uA
-1 - - uA
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Table 29: Operating temperature
Parameter Min. Ty p. Max. Unit
Normal operation temperature -30 25 80 ℃
Extended operation temperature* -40 25 85 ℃
Storage temperature -45 25 +90 ℃
*Note: Module is able to make and receive voice calls, data calls, SMS and make
WCDMA/HSPA+/LTE traffic in -40℃ ~ +85℃. The performance will be reduced slightly from
the 3GPP specifications if the temperature is outside the normal operating temperature range
and still within the extreme operating temperature range.
5.3 Operating Mode
5.3.1 Operating Mode Definition
The table below summarizes the various operating modes of Module series products.
Table 30: Operating mode Definitions
Mode Function
In this case, the current consumption of module will be reduced to the
LTE Sleep
minimal level and the module can still receive paging message and
SMS.
LTE Idle
Software is active. Module is registered to the network, and the
module is ready to communicate.
Connection between two subscribers is in progress. In this case, the
LTE Talk
power consumption depends on network settings such as DTX off/on,
FR/EFR/HR, hopping sequences, antenna.
Normal operation
LTE Standby
Module is ready for data transmission, but no data is currently sent or
received. In this case, power consumption depends on network
settings.
There is data transmission in progress. In this case, power
LTE transmission
consumption is related to network settings (e.g. power control level);
uplink/downlink data rates, etc.
AT command “AT+CFUN=0” can be used to set the module to a
minimum functionality mode without removing the power supply. In
Minimum functionality
mode
this mode, the RF part of the module will not work and the USIM
card will not be accessible, but the serial port and USB port are still
accessible. The power consumption in this mode is lower than normal
mode.
AT command “AT+CFUN=4” or pulling down the FLIGHTMODE
Flight mode
pin can be used to set the module to flight mode without removing the
power supply. In this mode, the RF part of the module will not work
but the serial port and USB port are still accessible. The power
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consumption in this mode is lower than normal mode.
Module will go into power off mode by sending the AT command
Power off
“AT+CPOF” or by pulling down the PWRKEY pin normally. In this
mode the power management unit shuts down the power supply and
software is not active. The serial port and USB are is not accessible.
5.3.2 Sleep Mode
In sleep mode, the current consumption of module will be reduced to the minimal level, and
module can still receive paging message and SMS.
Several hardware and software conditions must be satisfied together in order to let Module enter
into sleep mode:
1. UART condition
2. USB condition
3. Software condition
Note: Before designing, pay attention to how to realize sleeping/waking function and refer to
Document [26] for more details.
5.3.3 Minimum Functionality Mode and Flight Mode
Minimum functionality mode ceasesa majority functionof module, thus minimizing the power
consumption. This mode is set by the AT command which provides a choice of the functionality
levels.
● AT+CFUN=0: Minimum functionality
● AT+CFUN=1: Full functionality (Default)
● AT+CFUN=4: Flight mode
If Module has been set to minimum functionality mode, the RF function and USIM card function
will be closed. In this case, the serial port and USB are still accessible, but RF function and USIM
card will be unavailable.
If Module has been set to flight mode, the RF function will be closed. In this case, the serial port
and USB are still accessible, but RF function will be unavailable.
When Module is in minimum functionality or flight mode, it can return to full functionality by the
AT command “AT+CFUN=1”.
5.4 Current Consumption
The current consumption is listed in the table below.
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Table 31: Current consumption on VBAT Pins (VBAT=3.8V)
[4] GSM 07.10 Support GSM 07.10 multiplexing protocol
[5] GSM 07.05
[6] GSM 11.14
[7] GSM 11.11
[8] GSM 03.38
[9] GSM 11.10
[10] 3GPP TS 51.010-1
[11] 3GPP TS 34.124
[12] 3GPP TS 34.121
[13] 3GPP TS 34.123-1
[14] 3GPP TS 34.123-3
[15] EN 301 908-02 V2.2.1
[16] EN 301 489-24 V1.2.1
[17] IEC/EN60950-1(2001) Safety of information technology equipment (2000)
[18] 3GPP TS 51.010-1
SIM7X00 Series_AT
Command Manual_V1.xx
ITU-T Draft new
recommendationV.25ter
SIM7X00 Series_AT Command Manual
Serial asynchronous automatic dialing and control
Digital cellular telecommunications (Phase 2+); AT command
set for GSM Mobile Equipment (ME)
Digital cellular telecommunications (Phase 2+); Use of Data
Terminal Equipment – Data Circuit terminating Equipment
(DTE – DCE) interface for Short Message Service (SMS)
and Cell Broadcast Service (CBS)
Digital cellular telecommunications system (Phase 2+);
Specification of the SIM Application Toolkit for the
Subscriber Identity Module – Mobile Equipment (SIM – ME)
interface
Digital cellular telecommunications system (Phase 2+);
Specification of the Subscriber Identity Module – Mobile
Equipment (SIM – ME) interface
Digital cellular telecommunications system (Phase 2+);
Alphabets and language-specific information
Digital cellular telecommunications system (Phase 2) ;
Mobile Station (MS) conformance specification; Part 1:
Conformance specification
Digital cellular telecommunications system (Release 5);
Mobile Station (MS) conformance specification
Electromagnetic Compatibility (EMC) for mobile terminals
and ancillary equipment.
Electromagnetic Compatibility (EMC) for mobile terminals
and ancillary equipment.
Technical Specification Group Radio Access Network;
Terminal conformance specification; Radio transmission and
reception (FDD)
User Equipment (UE) conformance specification; Part 3:
Abstract Test Suites.
Electromagnetic compatibility and Radio spectrum Matters
(ERM); Base Stations (BS) and User Equipment (UE) for
IMT-2000. Third Generation cellular networks; Part 2:
Harmonized EN for IMT-2000, CDMA Direct Spread
(UTRA FDD) (UE) covering essential requirements of article
3.2 of the R&TTE Directive
Electromagnetic compatibility and Radio Spectrum Matters
(ERM); Electromagnetic Compatibility (EMC) standard for
radio equipment and services; Part 24: Specific conditions for
IMT-2000 CDMA Direct Spread (UTRA) for Mobile and
portable (UE) radio and ancillary equipment
Digital cellular telecommunications system (Release 5);
Mobile Station (MS) conformance specification
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[19] GCF-CC V3.23.1 Global Certification Forum - Certification Criteria
Directive of the European Parliament and of the Council of
[20] 2002/95/EC
27 January 2003 on the restriction of the use of certain
hazardous substances in electrical and electronic equipment
(RoHS)
[21] Module
Module secondary SMT Guidelines
secondary-SMT-UGD-V1.xx
[22]
SIM7X00
Series_UART_Application
SIM7X00 Series_UART_Application Note
Note_V1.xx
SIM7X00 Series_USB
[23]
AUDIO_Application
Note_V1.xx
[24] Antenna design guidelines for
SIM7X00 Series_USB AUDIO_Application Note
Antenna design guidelines for diversity receiver system
diversity receiver system
[25] SIM7X00 Series_Sleep Mode_
SIM7X00 Series_Sleep Mode_ Application Note
Application Note_V1.xx
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D. Terms and Abbreviations
Table 40: Terms and Abbreviations
Abbreviation Description
ADC Analog-to-Digital Converter
ARP Antenna Reference Point
BER Bit Error Rate
BTS Base Transceiver Station
CS Coding Scheme
CSD Circuit Switched Data
CTS Clear to Send
DAC Digital-to-Analog Converter
DRX Discontinuous Reception
DSP Digital Signal Processor
DTE Data Terminal Equipment (typically computer, terminal, printer)
DTR Data Terminal Ready
DTX Discontinuous Transmission
EFR Enhanced Full Rate
EGSM Enhanced GSM
EMC Electromagnetic Compatibility
ESD Electrostatic Discharge
ETS European Telecommunication Standard
EVDO Evolution Data Only
FCC Federal Communications Commission (U.S.)
FD SIM fix dialing phonebook
FDMA Frequency Division Multiple Access
FR Full Rate
GMSK Gaussian Minimum Shift Keying
GPRS General Packet Radio Service
GSM Global Standard for Mobile Communications
GNSS Global Navigation Satellite System
HR Half Rate
HSPA High Speed Packet Access
I2C Inter-Integrated Circuit
IMEI International Mobile Equipment Identity
LTE Long Term Evolution
MO Mobile Originated
MS Mobile Station (GSM engine), also referred to as TE
MT Mobile Terminated
PAP Password Authentication Protocol
PBCCH Packet Switched Broadcast Control Channel
PCB Printed Circuit Board
PCS Personal Communication System, also referred to as GSM 1900
RF Radio Frequency
RMS Root Mean Square (value)
RTC Real Time Clock
SIM Subscriber Identification Module
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SMS Short Message Service
SPI serial peripheral interface
SMPS Switched-mode power supply
TDMA Time Division Multiple Access
TE Terminal Equipment, also referred to as DTE
TX Transmit Direction
UART Universal Asynchronous Receiver & Transmitter
VSWR Voltage Standing Wave Ratio
SM SIM phonebook
NC Not connect
EDGE Enhanced data rates for GSM evolution
HSDPA High Speed Downlink Packet Access
HSUPA High Speed Uplink Packet Access
ZIF Zero intermediate frequency
WCDMA Wideband Code Division Multiple Access
VCTCXO Voltage control temperature-compensated crystal oscillator
USIM Universal subscriber identity module
UMTS Universal mobile telecommunications system
UART Universal asynchronous receiver transmitter
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E. Safety Caution
Table 41: Safety caution
Marks Requirements
When in a hospital or other health care facility, observe the restrictions about the use
of mobiles. Switch the cellular terminal or mobile off, medical equipment may be
sensitive and not operate normally due to RF energy interference.
Switch off the cellular terminal or mobile before boarding an aircraft. Make sure it is
switched off. The operation of wireless appliances in an aircraft is forbidden to
prevent interference with communication systems. Forgeting to think much of these
instructions may impact the flight safety or offend local legal action, or both.
Do not operate the cellular terminal or mobile in the presence of flammable gases or
fumes. Switch off the cellular terminal when you are near petrol stations, fuel depots,
chemical plants or where blasting operations are in progress. Operation of any
electrical equipment in potentially explosive atmospheres can constitute a safety
hazard.
Your cellular terminal or mobile receives and transmits radio frequency energy while
switched on. RF interference can occur if it is used close to TV sets, radios,
computers or other electric equipment.
Road safety comes first! Do not use a hand-held cellular terminal or mobile when
driving a vehicle, unless it is securely mounted in a holder for hands free operation.
Before making a call with a hand-held terminal or mobile, park the vehicle.
GSM cellular terminals or mobiles operate over radio frequency signals and cellular
networks and cannot be guaranteed to connect in all conditions, especially with a
mobile fee or an invalid SIM card. While you are in this condition and need emergent
help, please remember to use emergency calls. In order to make or receive calls, the
cellular terminal or mobile must be switched on and in a service area with adequate
cellular signal strength.
Some networks do not allow for emergency call if certain network services or phone
features are in use (e.g. lock functions, fixed dialing etc.). You may have to
deactivate those features before you can make an emergency call.
Also, some networks require that a valid SIM card be properly inserted in the cellular