Used Motorola V3 GSM unlocked with battery, battery door and charger. Works great. 

Network unlocked:

2G  Quadriband : 850Mhz / 900Mhz / 1800Mhz / 1900Mhz

Sim Card size: Standard Sim Card

Where can I use this phone in USA: T-Mobile, Metropcs, Straight Talk, Ultra Mobile, Lyca Mobile, Spot Mobile, Ting, Univision Mobile and all other T-Mobile MVNOs.

Where can I use this phone outside USA: all carriers Worldwide with GSM service that support 2G service (basically all GSM carriers Worldwide). 

This phone will NOT work with Sprint or Verizon ( CDMA carriers ).

This phone will no longer work with AT&T and all AT&T MVNO's due to AT&T shutdown their 2G network by the end of 2016.