Pete\'s crappy iPhone wrote:
The root of my problem is picture messages sent to me from a tmobile phone, I proved this 100% and even did it simulated it with 2 other iphones that went searching right away and the pic never comes though. A full restore from itunes solves the issue until a tmobile carrier sends another pic and the base band crashes. I do not know why this happens but it is 100% the root of my searching issue.
I agree with Pete's root cause as I've experienced it myself on my phone and my wife's phone. We've been experiencing what we thought were random signal search loop problems since October. The odd thing was both our phones would almost always go into the search loop within minutes of each others. I have an iPhone 4 running 5.0.1 and my wife has an iPhone 4s also running 5.0.1. We've been to the genius bar 4 times, had many phone calls with AT&T, had phones replaced, sim cards replaced, erased, restored, restored as new, you name it, we've done it all to keep this problem from recurring.
I think now we may have discovered a prevention mechanism. This past week, we correlated the timing of our phone's going into signal search loop with the sending of an MMS message from a friends Verizon Droid. Both our phones entered the loop and we both restored. Long story short, the Droid friend asked my wife if she got the pic, she said no so he resent. her phone immediately went back to signal search loop. To verify, the friend sent me a normal text which I received followed by a MMS pic which started my phone into signal search loop for the 2nd time that day.
So the work around that seems to be working.....turn off MMS messaging. At least until AT&T and/or Apple provide a patch. I will also add that prior to the 5.0.x OS, I never had a problem receiving MMS messages from my droid friends. Seems to me, this is an Apple defect.