I'm giving my old AT&T iPhone 4 to a friend from Europe so she can use it on T-Mobile while visiting the US. The phone still has my original SIM card. I no longer use this phone since I now have a 5s. I requested an unlock from AT&T and received an e-mail confirming that it was approved. I have followed all the instructions in the e-mail... After restoring, I erased the phone and went through the setup procedure again. How can I verify that the phone is really unlocked? When I go to Settings > General > About, it says Carrier: AT&T 14.2. Does that mean it is still locked, or is that just a result of it still having the original AT&T SIM card? Assuming that it really is unlocked, should I now erase the phone again then have my friend put her SIM card into it and set it up for her account? Sorry, I'm new to this unlocking stuff.