One day I decided either to power off (hold down sleep/week, use red slider) my iPhone 3G and turn it back on or reset it (holding down sleep/wake + home) and I was surprised by seeing the graphical prompt telling me to plug it into iTunes. Woah! Anyhow, I did plug it into my PC and that "fixed" things. What I'm scared about is say I'm out somewhere using some app and my iPhone hangs and I'm forced to reboot (or it reboots itself) and then get stuck in the please plug iPhone into USB prompt. At that point, I don't think I can make or receive calls or get to my contacts. Basically, I'm worried about being w/o a phone until a get to a computer w/iTunes and missing a date, important meeting, being unable to reach someone picking me up from the airport, etc. Should I be worried? Has anyone hit this and recovered from it w/o getting to their computer? It's not like I carry around my laptop everywhere I go. I stumbled across http://www.ehow.com/how_4684430_iphone-out-plug-itunes-mode.html but am unsure of its effectiveness. Should I carry around a spare GSM phone or a spare phone, just in case? I've never had to worry about this until now w/other phones. To be clear, my phone isn't jailbroken and I never intend to either.