How to get ETF for iphone 5s in t-mobile?

I'm planing to buy iphone 5s. So if i get iphone 5s for $149 in t-mobile. After buying it immediately can i pay ETF(early termination fee) of$200 and take the phone with no contract? If does, will it be locked or unlocked. And will this be possible?

T-Mobile does not sell the iPhone 5s for $149. That would be the down payment only. T-Mobile no longer offers contracts to new customers since they went to a different business model earlier this year, so there's no ETF. However, you would have to pay for the phone in full before they would unlock it.

It would be easier to just purchase the factory unlocked model from the Apple store.