A device is communicatively connected to a remote transaction processing system. In at least one embodiment, the device comprises a dedicated power supply that is independent of a mains power supply, and has an operational state that is set according to an outcome of a transaction processed by the remote transaction processing system. The remote transaction processing system processes the transaction via communication with a separate mobile communications device. In another embodiment, a system comprises a device having a primary function other than facilitating communication, an interface for operating the device, and a transaction processing system that is remote from the device. The device, the interface, and the transaction processing system communicate wirelessly. The transaction processing system is configured to process payment transactions for usage of the device, and the outcome of the payment transactions determines whether the device is operational to provide its primary function.