A vehicle may identify a highest-ranked seating zone for a mobile device using values determined from signal strengths from wireless sensors, the values indicating probabilities of the mobile device being located in each of a plurality of seating zones. The vehicle may also assign the mobile device to the highest-ranked seating zone if the mobile device indicates a higher probability for the zone than other mobile devices. Responsive to determining the mobile device is located within a vehicle, the mobile device may determine position ranks for each of a plurality of seating zones of the vehicle using signal strength values to vehicle wireless sensors, determine confidence values for each of the seating zones using the position ranks, and receive a seating zone assignment responsive to sending the confidence values to the vehicle.