The Timer tab can be used to alert you with an audible signal when a set amount of time has passed.
Open the Alarm/Clock application, then select the Timer tab .
Set the time on the digital timer. Tap the Hour, Minute and/or Second field(s) and enter the numbers as necessary.
Tap Vibration to checkmark the setting to have the phone vibrate when the set time expires.
Tap Alert sound to select an alert sound (tap Alert tone or Music) for the timer, then tap OK. Adjust the alert volume on the Alert volume slider bar, if necessary.
Tap Start at the bottom of the screen to begin the time countdown.
Once the alarm sounds, tap Stop to stop the timer.