I travel frequently by automobile and use my iPhone 5S as my navigation unit. I would like to be able to prevent all calls fro taking over the phone while they are incoming (which happens during DND mode) and simply send all incoming calls to voicemail for a time. I want to drive as safely as possible and eliminating the need to force each individual call to voicemail would be an enormous help. I still need my data connection to remain active so my navigation app still functions.
There must be a way to make this happen.