A SIM card vending machine at Heathrow airport, London.
I recently posted a bog about taking my old Samsung cell phone to Greece and finding I was unable to insert a local SIM card due to the fact that AT&T had my phone locked.

I bought the phone from AT&T and then upgraded to a different model discontinuing the use of the old phone. I incorrectly assumed that I could still use my old phone when I inserted a new SIM card. Not! AT&T has it locked.

I've just arrived at London's Heathrow airport and found a vending machine for SIM cards and once again I'm angry that AT&T has my old phone locked.

Can anyone tell me why AT&T does this after I paid for my phone and use another phone on their network? In Greece and England phone providers do not lock the phones that they sell. Why does AT&T?

Is AT&T bilking its customers? My guess is a resounding, YES!