Features: 1) Make DDD, IDD and local calls, and charge the fee with valid card 2) Multiple user cards compatible on the same card reader 3) Accurately identify charge command and control the charge process 4) Dynamic display the balance of the card and call duration in the call 5) Update tariff rate table, parameters and program via management system 6) Supporting two communication modes, SMS and data 7) Supporting Ads playing 8) Alarm messages, such as handset-lose, door-open, low-battery, could be reported to the management system 9) Multi-language display available 10) Over-voltage and over-current protection design for the phone anti-lightning