After several days of trying to unlock my phone, I succeeded!! It has been working great for weeks. I have not had any problems with the internet until today. It says could not activate cellular data network. I have in the apn epc.tmobile.com. Another phone (not an iphone) on the account still has the internet working. Any suggestions, anyone? The only other problem I've had is it doesnt ring all the time and I will see that I have a missed call. Cost me winning a trip to mexico today! thank you!!