1.Support dual GSM900/1800 2.Data Service, GPRS or CSD, Connect to a computer 3.PC fax sending and receiving, connect to computer 4.Volume modification 5.Call restriction 6.Support 12/16 kHz meter pulse or reversal signal for charging 7.Support CLID 8.Call in / Call out / Call waiting limitation function 9.Lock up function: SIM card, network, cell and operated company 10.Local No. / direct No. / limited No. setting 11.Available for being connected to the PBX as a wireless trunk 12.Minute alert tone