Do you belong to the group of users who like to dial in to participate in radio station call in contest? How when DJ open the line, all users try to dial in to get through so can win prizes? Re-dial is good when call fail to get through but it requires you to constantly tap it
How many times you have mis-placed your smart-phone and you try to call the number and hear the sound coming from to retrieve it. What if the smart-phone is set to silent mode or low volume at the point you mis-place?