I recently switched from AT&T to T-Mobile. After I paid off my last bill and ETF, they unlocked an iPhone for me that was previously used on AT&T (via their online site). It says you can unlock up to 5 phones per year. My question is: If I buy a used iPhone off ebay or craigslist that is locked to AT&T and then submit the unlock request (while again checking the box as a former subscriber), will AT&T unlock the phone for me even though I never personally used the phone on their network via my own account? Has anyone attempted this in my same situation? Thanks!