Can an att iphone 4 work on tmoblile?

I recently got an iphone 4 from a friend but the phone is on att and I have tmobile and I really want to use the phone and I think all I need is 20$ but they can put it on tmobile

I'm not really sure if an att iPhone will work on tmobile, but I do know that they can transfer most phones from Verizon and att to the tmobile network

Yes it can. They both use sim cards, and as such as long as it is unlocked it will have access to the t-mobile network. If you then download the carrier update for t-mobile you will have access to the 4g network and maybe 4g LTE.

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