The cellular company probably doesn’t want a used phone back ... there probably is no clause for repossession of the phone. They don’t want the phone.
The contract would be enforceable against the estate (if she had one, which she likely didn’t) — but it is unlikely to be pursued (looking for full payment on a cellular contract which was intended to last 2 years, but lasted only 9 months because the girl died).
SnakeDoc
I just switched from AT&T Tilt phones to new Droids with Verizon, after fulfilling the terms of my old AT&T contract. I sent my old tilts to Wal mart and got 66 dollars per phone. Somebody wants the old phones. Check out the price difference on phones with and without a contract.