Sure, using smartphones in a crowded place is a big no-no, and mobiles make it impossible to relax, but they still have their uses. And one of them, at least on GSM and UMTS phones, is easy (relatively) access to emergency services. Thanks to Willy Gonzales of reminding me of this feature via e-mail.

Most, if not all, GSM-based phones make it easy for you to dial 112, the magic number to call for help. Pressing 112 then call is possible even when the keypad is locked. The GSM standard demands that any active network, even those the caller isn't a part of, must connect that call. CDMA isn't left out, at least in the US. The FCC requires that mobiles allow callers to call 911-free of charge.

It's All About the Money: There are reports that some service operators will only connect a 112 call if the caller is a paying customer or roamer. "Sorry, you're call cannot be completed. Just die."