If you misplace your iPhone but it is still connected to the Apple Watch you can use the watch to find where you left your iPhone sitting. You can't track down a stolen iPhone, but this is still a really handy feature for people who are always misplacing their iPhone at home or in the office.
On the main glance screen that shows Airplane mode, Do Not Disturb and Silent Mode, tap the phone on the bottom left to ring your iPhone and tap and hold to ring and flash the iPhone flash. |