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The device can not receive any network signal, or the received signal is too
weak
1. Signal interference may exist nearby; please move to an open area before use.
2. Please contact your network operator and confirm that your location has signal.
Can not make or answer calls, send or receive messages when the device us
under normal operating conditions.
1. Check if the SIM card is proprly installed and recognised.
2. Check if the SIM card arrears down.
3. Check if flight mode is turned on.
4. Restart the device.
Network is busy.
The network traffic may be too high during peak hours, and thus can not make
calls. Please avoid using this device in such period, or wait a moment and try again.
