Product: Mobile > Cell Phones > More Cell Phone Providers > Metro PCS > SCH-R570
The tone being heard in regular intervals during a call would be the Minute Beep feature. This feature is meant to serve as a reminder of the minutes used on a particular call.
To disable the minute beep feature follow the steps below:
For more information on the MetroPCS SCH-R570 (Messager III) click here.