Default Phone stuck on EDGE

Hello everyone,

I asked about this in other threads, and some people tried to help me. The problem is than the phone is stuck on EDGE no matter what i do, i have tried flashing back to stock (Odin and Kies), flashing other modems (no luck) and everyone was out of ideas. I was very frustrated...

Searching i found this tread:

So i decided to check the imei of my phone, and it results its not the same as the one on the sticker in the back of the phone. I checked the imei and its not reported as robbed or anything like that.

Could this be my problem??