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Device registration is required before establishing a data or voice call. Once the device powers up, it will automatically scan and aquire a network operator based on the SIM. Then it will will perform a registration. If teh device is unable to acquire a network operator, the device cannot be registered and so voice or data call cannot be made.
With Online AT Command Tester tool, you can easily check the registration status of the device in the ‘Diagnostic Tab’
You can also send the AT command under the ‘Command Mode’ tab,
Check the registration status before before setting up voice or data call. With AT Command Tester, you can also send batch of AT commands,
Try this script included in AT Command Tester Tool.
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//Script-at_creg.at
//Test AT+CREG AT command
//AT+CREG returns network registration status of device
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//List of supported write values for AT+CREG
AT+CREG=?
//Get current registration status
//If there is any error, CME error code is returned
AT+CREG?
//Configure to return unsolicited result code when network registration
//is disabled
AT+CREG=0
//Configure to return unsolicited result code with when network registration is enabled
AT+CREG=1
//Configure to return unsolicited result code when there is change in
//network registration status or change of network cell
AT+CREG=2
Output of above script in AT Command Tester Tool.
AT+CREG=?
+CREG: (0-2)
OK
AT+CREG?
+CREG: 2,1,"008E","CE87"
OK
The device is registered in home network.
AT+CREG=0
OK
AT+CREG=1
OK
AT+CREG=2
OK