You must first be sure that your telecomunication company can provide you with a SIM card that supports Static IP GPRS connection. Usally companies don’t have this feature. Otherwise you can only use client socket on your module.
THanks for your reply first, So, you mentioned about SIM card? that means GSM? So how about CDMA? what u mean is need to know the carrier can provide that kind of feature either using GSM / CDMA?