With all this talk about people buying the i7500 from Germany; I was wondering if T-mobile has any rules/detection against us using an android phone bought from outside, on the network using a normal voice+data plan like the $30+$10 plan. Because given the price difference of a 2 yr contract ($360) a new phone would in theory need to be over $560 before it is no longer worth buying outside. So what is the incentive of getting a simlocked phone, that costs more, and be locked into a 2 yr contract? I guess this applies to some of the other smartphones as well. TL;DR Can I buy a phone on ebay and use the $10 data plan? Can they stop me?