You must not have nothing special. For access to contact lists, use AT commands, which supported by your mobile phone. All mobile phones and GSM modems support such GSM commands, that allow
you read and send SMS, dial numbers, connect to other phones or Internet in standard mode( like ground modems , but speed will be only 9600) and in GPRS mode, with speed 44K (4 channel) for download and 19K (2 channel) upload = it's for GPRS class 10.
For all cases it's done by AT commands. Read manual on AT commnads for your mobile phone.