Payphone with 800, 450 or 1,900MHz CDMA Frequency, Two-way SMS, Voice Mail and Caller ID... Country of Origin:China ( ... , quick response for dialing numbers, no radiation for human Equipped battery for back up when short of external power supply GPRS ... 90% Payphone with 800, 450 or 1,900MHz CDMA Frequency, Two-way SMS, Voice Mail and Caller ID