Switch to T-mobile to pay Sprint ETF, then switch to AT&T?

Is there anything preventing you from using T-mobile to pay your Sprint ETF and then canceling T-mobile and then switching to AT&T? The new T-mobile doesn't have any contracts so you wouldn't have to pay anything back to them, right?

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You can do this if you want to pay for the phone that you have to buy through T-mobile in full. This is because with this offer T-mobile doesn't give you a subsidized phone at a discount, you either have to pay the full price for a phone, or finance it. If you finance it, you have to pay for the rest if you cancel with T-mobile.

The solution - get a cheap phone from T-mobile when you switch, then sell it later. In this case it would be wise to not get an expensive phone assuming you'd get a subsidized one through AT&T anyway. This way you don't have to worry about getting it unlocked and it working on AT&T's LTE, etc.

Also, I just read it may take T-mobile 8 weeks to send you the amount for the ETF via mastercard. So I wouldn't count on switching right away.

Unless you have awful reception, I don't know why you'd even want to switch from T-mo. I switched to the Uncarrier this past summer, and barring a genuine switch in philosophy by AT&T, Verizon or Sprint, T-mo is where I am going to be.