I left my small town to go to college, and when i left, i turned my phone in to US cellular, paid off my final debt to them, and they told me i could go, i needed to do nothing else. There wouldn't be an early cancellation fee because i was moving to a place where there was no US cellular.
A month later I got a bill saying i owed $200 ( or there about). i called and talked to a supervisor, who told me they'd charged me an early cancellation fee, plus $50 i'd racked up in charges i don't remember using. i agreed to pay the $50, and they told me i had to fax in a proof of residence change.