After i pwned my phone first with custom 2.0, then with 2.0.1 i was experiencing a low gsm signal and often a NO SERVICE, on places where i used to have full bars on 1.1.4!That really bugged me so I decided to try playing with the bootloader since my phone is pwned with bootneuter installed.I was on:2.0.1 with bootloader 3.9 FB.I flashed with bootneuter to 4.6 in a moment i had NO SERVICE message an I got FULL BARS again.I guess newer firmware works better with newer bootloader.

That's weird. I have even better signal than before and I still have my old 3.9 BL

I know it sounds weired but that`s the truth!I thought it`s something to do with my custom 2.0.1 but switching bootloaders helped solving this problem!

I have the exact same problem, weak signal with occasional no service places where I used to have full service. I did try switching the bootloader it improved but for only for 5-10 mins. I tried changing the bootloader again but with no success. Still very weak signals. Never more than -95 DB.