What are the disadvantages using an iPhone on T-mobile network?

Say I get an unlocked iPhone and use it on the T-Mobile network. As long as I have all the unlimited plans, would anything happen? I'm talking maybe a ridiculous hidden charge that could potentially get added, not being able to get calls, or access the web?

Anyone have it and could give me some input, opinions.

I don't want AT&T for the record so all those answers can go away.
 
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