Steps to brake AT&T contract and switch to T mobile?

I'm in AT&T contract for 2 smartphones. I want to switch to T mobile. What are steps to follow. To get AT&T contract broken; AT&T (iphone and galaxy S3) smartphones unlocked and transfer numbers to T mobile avoiding any service outage.

T-mobile is terrible. They are a horrible company, if you switch go to Verizon. You can go to best buy and they can tell you what your cancellation fees will be, they can also port in your phone number and save it. They do T-mobile, ATT, Verizon, and Sprint.

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