1.Poor quality of calls: Please check if the volume of the device is adjusted to an acceptable comfortable level
2.When the device is used in the areas with poor signal, e.g. near tall buildings or in basements, the call quality may be affected adversely
3.When this device is used in a high call intensity period, like rush hour, call failure may be caused by network congestion
4.Standby time is reduced, Standby time is related to the system setting of network, it may be that the phone is used in an area with poor signal
Where there is poor signal, the phone will constantly attempt to communicate by searching for base station signal and battery will lose charge quicker, hence the standby time is reduced
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