unlocked iphone 4 on t mobile monthly 4g?

Absolutely, but you won't be able to access T-Mobile's 4G, as the two are not compatible. You will be limited to EDGE/2g speeds.
 
can a unlcoked iphone 4 work on the pre paid t mobile 50 unlimited all plan

Yes ! If you unlock your iPhone 4 from carrier lock, it works on T-mobile . If you want to get it unlocked, use Remote unlocking method . You can get it from any of the online vendors like SimpleUnlocking.com to unlock it .
 
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