Operation Manual

47
Troubleshooting
Problem Possible causes Solutions
Absence of network service. Weak or no signal. Move to an area with signal coverage.
SIM card not valid. Contact network service provider.
Network too busy. Try again later.
Impossible to make a call. Run out of credit. Top up credit.
Impossible to send an SMS. Run out of credit. Top up credit.
The SMS Center number Set the SMS Center number
is incorrect. on the SIM card by means
of a mobile phone.
The receiver does not have a compatible phone. Check the phone compatibility.