You are about to buy, a used, Motorola C139 phone (TFC139B from Cingular or Tracfone), now flashed to a generic and unlocked firmware, to be used worldwide with any GSM carrier (2G though), so, if you have a 2G SIM card (like the one I have to test phones, which is a SpeedTalk, a T-Mobile reseller), you will be fine.
Some Cingular ones, are just unlocked, keeping their original Cingular firmware.
This is a 20+ years old phone, and battery is holding charge, but not like new.
This phone should be bought mostly for collectors, or to send it to another country that still uses 2G signal (Mexico, Central and South America).
In US the 2G signal is almost disappearing (and the 3G too), it works in some places, and you have to make sure you have 2G signal in your area, plus you should have a 2G SIM card (which are difficult to find nowadays).
Includes: the phone, battery, battery cover, and charger.
It holds the big SIM card size.
Please see pics for better description.