The ericsson G35 fixed cellular terminal replaces the popular ericsson f250m fixed cellular terminal. The ericsson G35 can be used as a stand alone device to enable the user to plug in a standard analogue (POTS) telephone to make and receive calls using the GSM network, or the ericsson G35 can be connected to the analogue trunk port of a PBX telephone system enabling the extension users on the phone system to make calls directly over the GSM mobile phone network. The ericsson G35 is ideal for use with mobile phone tariffs offering low cost or free calls to mobile phones for cost reduction or as a back up telephone line.