said by NOCMan:I worded that wrong. I meant to say if you cancel the line, then you should be required to return the phone. It completely eliminates the scam. Though people will cry foul about their personal information being on the phone.
Still if you cancel and want to keep the phone, pony up the full retail cost.
I'm against ETF's generally, especially for things like cable contracts where you return the equipment. I can understand a reasonable processing fee, but nailing people for money because they're leaving your service because of whatever issues is just plain wrong.
Agreed on all points. 
