Earlier this month we hard that T-Mobile would be preparing to allow unlocked iPhone customers to walk into a t-mobile store and receive an official plan and official micro sim card. T-Mobile offers $69.99/month Unlimted text, talk, and data usage which is estimated to save 50$ a month over AT&T’s current rate plus it is completely UNLIMITED.

The better news is that T-Mobile’s HSPA+ 4G based service does in fact support the iPhone 4S. This shows a 70 percent increase in speed over its predecessor 3G.
T-Mobile also allows for calling over wifi using a third party application. This is great news for irritated iPhone AT&T customers however, this might now be such great news for Sprint.
Let us now what you think below?
Source: 9to5Mac

im using the 4s on T-mobile right now, but im on 2G or E network. how is it possible to get 4g network?
You may need to go to a t-mobile store.