Apparatus, systems, and methods for improving cellular network coverage using a vehicle-based data transmission extender. One such generalized method includes establishing communication between a fixed base station of a cellular network and a first wireless device, which includes a data transmission module that is part of a first vehicle. Data is relayed between the fixed base station and a second wireless device using the first wireless device to extend geographic coverage of the cellular network to the second wireless device. The method also includes at least one of: detecting, using a signal detector, a signal emitted from the second wireless device, the signal detector being part of the first vehicle; and tracking, using a data meter, an amount of data relayed via the first wireless device between the fixed base station and the second wireless device over the cellular network, the data meter being part of the first vehicle.