AT&T
I was recycling cell phones for a local non-profit which provides them free to battered women so they can call 911 and perhaps save their lives.
We got a nice, clean AT&T phone which was donated when the owner died.
AT&T refused to even consider unlocking it because 1) the owner had the unmitigated gall to DIE before his contract was up h ence he still owed them money, and 2) we couldn't provide the dead guy's social security number. They insisted we call the family to get it before they'd even talk to us. "Hi, what was your dad's social security number? We promise we won't steal his identity."
But what the heck, they're the phone company and they don't have to care.
Biting the hand that feeds IT
