1. Supporting all frequencies of GSM/GPRS/CDMA, and PHS 1900MHZ. 2. Incoming call Number Display. 3. Pre-set area code, IP number, Special service number, and any other head number. 4. Privilege setting for international distant and local call-in and call-out. 5. PIN code protection for SIM/UIM card. 6. Wireless and wired channel switch, supporting two phone numbers. 7. Indicator for signal, power and in-use function. 8. Billing support. 9. Supporting external battery storage. 10. Supporting external switch for group users. 11. Internet connection (optional). 12. Network management function (optional). 13. G3 fax function (optional).