HELP! PLEASE! Samsung Fascinate Flashed to metro PCS but no Internet or MMS!

[Cptdolce]

I bought the Verizon Samsung Fascinate that is already flashed to Metro PCS but I have no MMS or Internet on it every time I would click on the internet tab it would tell me no network connection or something like that I don't know what to do I already took it to someone and he told me that every time he would change it and then reboot it, it would just go back to it's default he is all out of ideas and doesn't know what to do and so am I. Can someone please help me everything for MMS and internet is still set on VZW default settings. PLEASE HELP!