... Basic Functions: 1. Supporting GSM-900M/1800M/850M/1900M digital mobile communication network.2. Support PSTN network, and switch the ... calls and dialed calls. Handset function: 1. 2.4 G digital wireless phone.2. Locking keypad.3. Calculating call duration.4. ... which can be divided into sixteen category, including wireless telephone, GSM terminal, wireless network card, PBX related to GSM, CDMA, ...