So when I switched from ATT to Tmo my blackberry I was told was now running on 2g rather than the original 3g. The phone died shortly after I switched so I didn't really get a chance to check the speed. Anyway, it was somthing tmo told me, is it true or is it something they say to get you to buy their phones? If it's true, is it the carrier switching or unlocking process that causes this generational change? I ask because I see a 4g phone on ebay I may want to buy that says it's unlocked for any carrier, I don't know who the original carrier was or if it matters. Thanks!