If I got an iPhone on T-Mobile how well would it work?

I was gonna see if I could get this iPhone 4 from AT&T unlocked on T-Mobile, I use the internet a lot but I have Wi-Fi at home, but if I get 500MB of data or 2.5GB (I'l probably g over both) how would the speeds be after and are there any other networks you would recommend if T-Mobile speeds are not any good, also is there a way you can mix and match t-mobile plans like, unlimited web, and text and like 300 minutes for less than $50

Added (1). I'm looking for answers on how the data speed would be if I went over dang y'all answer the question like I don't *** know it would work like any phone.

The iphone would work like any othr iphone i would guess

Like anyone other iPhone will on sprint or Verizon and att would work

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