1. Suitable for all frequencies of GSM or CDMA network. 2. Incoming calls and outgoing calls check function. 3. Pre-set the local code and IP special service number, add the IP number automatically while dialing the long distance call. 4. Calculate conversation time function. 5. Set all kinds of authorities about International,domestic and local incoming calls . 6. Telephone and its card lock each other. 7. Hand-free and adjust volume function. 8. The Melodious chord rings. 9. Wide LCD screen, clock and signal display function. 10. Furnish the back-up battery, while no external electrical power, converse continuously.