Iphone 2.2.1 Picks up signals and shows carrier and then no service :(
 

Hello there..

I got iphone from USA and its already got a Tornado sim jack in it.
It was stuck on IPHONE IS DISABLED. I flashed it and have performed jailbreak too.
Now the problem is iphone doesnt pick signals. I tried alot it gets carrier and signals for a while n then it goes to NO SERVICE..Iphone's IMEI starts with 011*********

Wot can be done to fix this problem??
waiting for the replies

Kind n best regards,
TOm