This phone is originally from At&t . But is unlocked . I tested this phone with At&t tmobile both work great . I am not sure about sprint or Verizon . international carrier will work great And most domestic prepaid carrier will work .this phone might work or might not work with Verizon or sprint I am not sure . If you are using sprint or Verizon and purchased this item . Return will not be accepted . Again this phone will work great with At&t and T-Mobile and all international carrier .