My daughter has been plagued recently with her BB 9000 going into SOS mode and not connecting to the ATT network.
After hours on the phone and a trip to get a new sims card today, the problem still existed. SO tonight I read a post that someone was advising to check the sims card housing for correct pressure on the sims card.
I took her battery cover off and immediately noticed that there was a corner mid plate screw missing. I then noticed that the opposite side screw was almost completely out. (Screw with white tamper filler was intact.)
Upon further inspection I noticed that all of the remaining screws were loose.
After tightening, the phone locked into 3G and has remained there!
So I checked my sons phone and his also had some loose screws, so I tightened and his reception also increased.
So all I can assume is that the mid plate was loose and not making connection and by tightening, the antenna somehow made a complete connection.
So I would suggest that if you are having a reception issue not related to a service outage or poor reception, check your backplate screws and tighten them if loose!
Thanks