SHENZHEN TIANRUIXIANG COMMUNICATION EQUIPMENT LIMITED A17 사용자 설명서

The metal

face of the

SIM card is

polluted.

Clean the SIM card with a clean cloth

Poor received

signal quality

Signals are

obstructed.

For instance,

radio waves

cannot be
effectively

transmitted

nearby a

high building

or in a

basement.

Move to a place where signals can be effectively

transmitted

Line

congestions

occur when

you use the

mobile phone

in high-traffic

hours

Avoid using the mobile phone in high-traffic hours

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