by barbar 72
*UPDATED* Can't find your phone? Phone in silent? No problem, just send an SMS containing "wakemeup" (without quotes). Phone will now be in normal mode at full volume. You can then ring your phone and find it.
Update1: removed inconvenience that can be caused by sending ''Wakemeup" instead of "wakemeup" (credits : Ferdi Kramer)
Update2: can now be used with online sms services also (credits : Elshad Safibayov)