can't activate (sprint) CM9/rooted SPH-d700 **help**

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http://androidforums.com – Alright I'm sorry if this has been listed before. I bought a used clean ESN Epic 4g (sprint, btw whats the difference between that phone and the Galaxy S, or same phone?) It has CM9/ICS rooted (obviously)...a clean ESN (sprint checked it out) but I can't activate it with the rom and root. The codes given in the phone dialer don't do jack. I have heard/seen of this problem before but *cannot* for the life of me find an answer. I want to keep the phone rooted w/ CM9, but realize I do need to activate the phone! What is my best option here? Step by Step people. P.S. I am on OS X and (General)