Bad reception after jailbreak 1.1.2

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Downgrade from 1.1.2 preinstalled to 1.1.1. and then to 1.1.2 jailbroken

I bought iphone with 1.1.2 and 2 days ago did jailbreak, everything worked 
fine. Now I have 1.1.2 fully jailbroken, BUT I now have a problem with 
reception. I have a legit AT&T sim card and contract, and now i have low 
signal everywhere. and I know that something wrong with my iphone, because 
my g/f has an iphone too (not jailbroken) and I spent the whole day 
comparing bars, and I always have 1 bar less and sometimes I just have 1 
bar, where 5 bars suppose to be. The signal is even changing in the phone 
is staying on the same place. 

This is a very big problem, because some of my friends just told me that 
my phone was'n answering a few times when I was home (suppose to be 5 bar 
signal).

Any sugestion?

Thanks 

Original issue reported on code.google.com by belloru...@gmail.com on 13 Dec 2007 at 2:12