Help Mobile Network State Disconnected


Hi guys, I have problem with my network connection also my 3g does not work anymore, I was playing with my phone with some secret codes like a ##72786# on my epic 4g touch sprint phone flashed to metro pcs and now I have no 3G service. In the setting menu under network status say Sprint. How can I get my 3g back?. The mobile net. 3G is on and the wifi is off. I need to change the network to metro pcs in the status setting and how can do that? Thanks for your help and sorry for my bad English. :(
Running ICS OS.