Here’s a nice, free service that will help you find your iPhone ( or any other cell phone ): I Can’t Find My Phone. All you have to do is type in your phone number, and click on ‘ HELLO? ‘. In a few seconds your phone will ring, and if you answer it, you’ll hear: ‘ it looks like you found your phone. have a nice rest of the day!’
PS: if you loose your iPhone in a random bar, this service is worthless. You better look for it, on some ‘popular for no god damn reason’ tech sites…
