A vehicle wireless communications blocker may be used in a vehicle for an occupant's wireless communications device and may include a long-range and short-range wireless transceiver both coupled to a controller. The controller may be switchable between off-hook and on-hook states based upon control signals via the short-range wireless transceiver, and the occupant's wireless communications device may be blocked from occupant communication via the long-range transceiver when in the off-hook state. The blocker may include a housing to be installed in the vehicle, a short-range wireless transceiver carried by the housing to wirelessly communicate with the short-range wireless transceiver of the occupant's wireless communications device, and a controller carried by the housing and coupled to the short-range wireless transceiver to selectively switch the controller of the occupant's wireless communications device to the off-hook state so that the occupant's wireless communications device is blocked from occupant communication via the long-range transceiver.