Since I have to stay abroad for several month, I bought an unlock code online to unlock my Inspire 4G. Now I can use a SIM card from a carrier other than AT&T abroad. I chose the unlock code because I wanted to preserve the warranty. I did not root my phone. Now I'm in China and using a SIM card from CMCC, which is a local carrier. I was trying to use GPRS to access the Internet, but it didn't work. Someone told my since Inspire 4G was exclusively sold by AT&T, it had more restrictions than a normal Desire HD/G10. I will be in Germany for several months and I need another SIM card. I was wondering whether I could use data service there provided by O2. If not, I will simply buy a card to make phone calls and send messages.