Rom and Metro PCS

[mrsp]

I have a mogle. I had Metro PCS flash my phone to there service yesterday. But I cannot get my my MMS, wifi, or web to work.
My phone see's the wifi in my house, but it can't connect, even when I leave it open with no WEP.
From what I understand if my web doesn't work neither will my MMS.
My web wont work at all, I have edited all the settings from proxy and all that that I have read on the site many times.

I guess I could flash it to a custom rom, seeing as how my esn is in their system now. But is there a chance that it wont work at all with metro if I flash it? and if I do flash it what should I use? It used to be on Alltel.