just a heads up so this won't happen to you. a few friends claimed to have called me last monday and i told them all when i saw them in person that i received no calls from them (i didn't receive one phone call that day from anyone. a bit odd i thought). i also didn't hear from my girlfriend all day via text, which was strange. the next day web pages were not loading on my iphone. so i simply shut my phone off, waited 30 seconds, then turned it back on. none of my missed calls showed up in my call log, however 10 text messages from the previous day did. so for whatever reason, 3.1 update (i suspect) caused me to miss calls and texts for that full day. just a heads up to anyone who potentially runs into the same problems. hopefully this won't happen to me again.