i want an iphone 3g, but i have t-mobile. im planning on buying the iphone 3g from the apple store and unlocking it using the Turbo SIM Unlock chip. so all i have to do is buy the iphone 3g and then insert the Turbo SIM unlock thing with my t-mobile SIM card and it will work? or do i have to do something else? also, can i use the internet wherever i want if im paying for internet from t-mobile, or can i only use wifi? thanks in advance