Abstract: A system for restricting uses of moving phones used by drivers, but not passenger phones, and sometimes interrupting voice calls, including: (a) Provide for more than one level or state of restriction. (b) When a caller calls a person driving, play to the caller a query whether the call is important enough to put through, and put it through only if the caller responds affirmatively. (c) The phone is restricted in functionality when the vehicle is determined to be experiencing acceleration greater than a threshold. The restricting may be to play an alert sound to be heard by people listening to a voice conversation on the phone. The restricting may be to suspend a voice conversation on the phone.

Abstract: A system for restricting uses of moving phones used by solo drivers, but not passenger phones, and sometimes interrupting voice calls, including: (a) Don't depend on compliance by phone or car owners—make the restrictions automatic for phones moving above a threshold speed in selected areas; (b) unless the phone is not viewable by the driver or there is also a passenger in the vehicle, in which case the phone need not be restricted, to allow unrestricted use by passengers. (c) When a caller calls a person driving, play to the caller a query whether the call is important enough to put through, and put it through only if the caller responds affirmatively. (d) To delay and minimize cost of implementation while obtaining optimal initial benefit: (1) set up restricting first only in selected regions, and (2) implement first for newly issued phone numbers, then those issued in the last 2 or so years, then the last 4 or so years, etc. to about 15 years.