Was just looking for some traveling tips using my Lumia 920 in Italy. Firstly, I'd have to call At&t to unlock my phone for use over there, but once I do should I wait to buy a sim card there or just buy one in the states? I heard they were cheaper there. Is data expensive? I know that your phone has to be GSM, have 900 and 1800mhz, and unlocked, but should I use Vodafone or TIM? Thanks in advance!