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So I am on (unlucky) #21 of 4S now (in 16 months) and I finally decided to actually really actively read the entire logs in my phone. I found several things of interest last night right after the latest loss of service, here are three specific snippets.
I started googling parts of this looking for anything specific to that string...and this appears to be a mostly 4S/iOS5/not-fixed-in-iOS6 problem. It literally started for me when my iPhone 4 got stolen which happened like 2 weeks before the 4S came out. I had a 4 and had issues, but upgraded to a 4S when it came out. I have spent COUNTLESS hours over the last 16 months dealing with this crap, and this is the first little tidbit that I have actually figured out that makes it seem that it's NOT a carrier issue, it's OS related. Apple keeps swapping the phone out but boy do they like to point it to the carrier. Considering I've even gone so far as to change my damn phone number and get new accounts set up and it's STILL happening...its pretty safe for me to assume it's definitely Apple.
By "losing signal", my phone would do just that, lose signal. Go to "searching" or "no service", and it would last anywhere from a minute to in some cases an hour, or never come back, and even WIFI wouldn't connect during those times. Eventually it would come back on it's own, but restarting, pulling/replacing SIM, toggling airplane mode, didn't matter. I would try leaving "DATA ROAMING" on too, and that didn't make a difference either.