So a while back, my dad put me on his T-Mobile plan, and got me an LG Optimus T (P509). He said I could root it and do anything I wanted to do with it, even though I told him it would void the warranty. So I took the recommended steps to root my phone, and install some ROMs. I used the ROM Manager, but after I install what believed to be CM7 or CM10, my phone model said it was P506. So now, whenever I go to flash a ROM, I can't do anything based on P509, but can only flash ROMs based on P506. So I went back to stock Froyo, thinking I was knowing what I was doing, but when I got there, it said the network was busy, and I couldn't make any outgoing phone calls. I went back to the previous ROM I had, and now I can't make any phone calls at all. The phone has basically become useless. I need help on what to do, and if there is a possible way to just revert the phone back to the original factory settings.