I bought a Samsung Gal. Note sgh1717 while att wasy carrier. I had a small problem, so far back I can't even remember what it was. It wasn't the phone it was accounting. I was so frustrated I wound up paying them off just so I would never have to deal with them again. I went with T Mobile. Put sim card in and no problem. Then the phone wouldn't charge at all so under warranty I sent it to Samsung. When I got it back the phone was like new except it wouldn't respond to T Mobile . So I got unlocked again from att. I then could call out but I couldn't receive calls. I could receive text but couldn't send text. I had at unlock it again. T Mobile advise. Same thing. I got a new SIM card from T Mobile. Same thing. I called Samsung and they said it was the carrier. T Mobile has gone through their phone checking process and no change. Before I got att to unlock it again. I set it back to factory again so that doesn't help. SO ALL 3 companies say it's the other company. Can any of you help me? PS my user name describes me to a tea. I am 63 and know enough about technical stuff to be dangerous