HOW TO INCREASE THE NUMBER OF RINGS WHEN RECEIVING CALLS
HOW DO I INCREASE THE NUMBER OF RINGS WHEN RECEIVNG CALLS, BEFORE THE CALL GOES TO VOICE MAIL
iPhone 6, iOS 8.4.1
HOW DO I INCREASE THE NUMBER OF RINGS WHEN RECEIVNG CALLS, BEFORE THE CALL GOES TO VOICE MAIL
iPhone 6, iOS 8.4.1
You cannot, that is programmed in IOS.
It's actually programmed into the carrier's switch. You can call the carrier to change it, and some carriers have codes to change it.
HOW TO INCREASE THE NUMBER OF RINGS WHEN RECEIVING CALLS