Controlling a modem using AT commands

[Damith.J]

I have recently bought Multitech MTSMC-G2. AT commands are working fine. But when the SIM is entered it does not get registered with the network. AT+CPIN? returns ready signal. So I think the SIM is entered correct. I am from Sri Lanka. Is there special hardware requirements or commands that I should use to setup the GSM modem for my network. My network is Mobitel in Sri Lanka.

Further I have connected a suitable antenna as well. Still it gives the reply 99 which is for "No Signal" for the AT command AT+CSQ.

 

[ALMIGHTY TECH]

try with new sim card.. it may be problem of pin lock.. so try it with fresh and new unlocked sim card..

 

[Damith.J]

Thank you very much for the prompt reply. The AT+CPIN command replied "READY" so I thought pin lock is not the problem. Further more I inserted the same sim for a modem of a different brand of my friend. And I was able to send and receive sms successfully. That's why it has become a big issue for me.
AT+CREG is a failure as well. Have I missed anything in configuring the modem?