[Q] cancelling T-Mobile after 30 days & pay etf - classic plan

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http://forum.xda-developers.com – Hi all, I signed up yesterday for T-Mobile at Costco. I got a family plan with a galaxy s3(.01) and s4(150). I wanted to cancel on day 31 and pay the etf for both phones (400 + tax, I believe). Right after that I wanted to sign up month to month with their new plans. Does this plan sound feasible and had anyone tried this in the past? (HowTos)