"No Service" after updating to iPhone OS 3.1.3

After updating to iPhone OS 3.1.3 it seems that around noon it loses connection to the cellular network, telling me "No Service". This is in Belgium on the Proximus network with a 32GB iPhone 3GS.
Turning the phone off and on makes it register to the network again. I'm wondering if anyone else is experiencing the same.

I updated my iPhone 3G 16GB to 3.1.3 from 3.1.2 and have experienced an "No Service" incident.
From the text messages that were delivered after I noticed it and fixed it, it appears the problem occurred last night while I was at my part time job, inside of a heavily shielded building. I'm not certain about the exact moment, but I had been trying to look at an email because I had a very weak signal. Then I lost it, but that wasn't surprising because of the building.
After a reboot, it is working again. I'll post again if I loose my service again.
Message was edited by: Stephen Donovan

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