The disclosed implementations provide a system and method of predicting routes for mobile devices using wireless networks, including generating and sending content to a mobile device that is travelling on a predetermined route (e.g., a bus route determined by a transportation agency). The mobile device can scan for a wireless network that is installed on a vehicle travelling on a predetermined route. The system can predict which predetermined route the mobile device is travelling on by accessing a database that associates wireless networks with transportation vehicles. The system can confirm whether the mobile device is travelling on a predetermined route based on the device's sensor measurements, timestamps collected over a period of time and the identity of the wireless network that is connected to the device. The system can send content to the mobile device based on the mobile device's location and predicted future locations along the predetermined route.