SPRINT SERO - HowardForums Wiki
This site looks like they copied the nice HowardForums SERO Wiki but they added some usefull info, like coupon codes.
** SERO : Sprint - Official Thread PART III **MUST READ POST #1 BEFORE POSTING QUESTIONS!!!** - SlickDeals.net Forums
Addendum: I'm an existing non SERO Sprint customer under contract can I use SERO?
Yes. Procedure depends on if you want to keep your phone numbers.
Porting:
See Wiki for some usefull info. But the Wiki above says port your number to a PrePaid phone and then back as one option. You cannot do this. Sprint will not port #'s in from PrePaid phones (i've read). Currently I am porting to AT&T (cost $36.00 to activate) and the account will be pro-rated for the month. I'll update my success with this. As the FAQ says (somewhere) port after you activate newly assigned phone #'s. There are restrictions porting like business lines and proper info over who owns the line. If your not sure you can ask Sprint to check before you do anything. If anything is wrong with porting your whole package will get held up. I'm not porting my Sprint # out to AT&T until I get a tracking # from SERO.
Under Contract:
No biggy, I think some people are hung up on this. You pay the Termination Fee and move on. You'll probably save most of it right from the get go. For example I can get the Mogul $112.00 cheaper plus there currently is a $50.00 coupon code on SERO. So there is a $162.00 to cover Termination Fees. Plus sell your existing Sprint phone or a new discounted one you get through SERO. Just in case I used my wifes SSN and email for the SERO account because one already exists with sprint under my SSN and email.