Jul 3, 2013
I have a tmobile HTC One. Earlier today I lost signal and have not been able to get it back. I have tried restarting the phone numerous times and selecting a network operator manually from the settings. When I lost signal I was on a subway and underground where I usually don't have signal, but at this point I am back home and I still don't have signal. I just tried wiping my phone and reflashing the ROM I was running (Android Revolution HD 10.2) to no avail. I have also tried dialing *#*#4636#*#* and restarting the radio. When I either restart the radio or put it in and out of airplane mode I get a message stating "restricted access changed". I am at a loss at this point so I would greatly appreciate any help.
You know strangely enough, I was down in San Diego for my Wedding the past month and noticed that I would lose a signal entirely. I couldn't call out and couldn't connect to the Mobile Network unless I did a reset of my phone.

Not sure if this is related to yours or not, but it seems like yours is significantly worse.

Do you have a SIM card that's not seated properly, perhaps?
I bought the HTC One today and T-mobile told me this is a known issue. It has to do with HTC running off of different towers they think. But it's being worked on and they said it seems to be getting better so far.