How to get 4g lte on a Unlocked iphone 4s on tmobile?

IPhone 4s does not have 4g lte...
If 4g is important for you then you should consider upgrading your phone.
Maybe iPhone 5 or galaxy s4
 
Its not possible, the iPhone 4S is only able to get 3G. Apple didn't give 4g until the iPhone 5.

The phone is not able even if the carrier is.
 
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