The disclosure provides devices, systems, and methods for determining a position of a mobile communication device by communicating with the device via a Short Messaging System (SMS). A location query is submitted to an SMS center, which formats a first SMS message for delivery to the device. The first SMS message is delivered to a designated SMS port on the device. A location logic on the device receives the SMS via the SMS port, extracts the location query, and attempts to calculate a location from received satellite signals. The calculated location is submitted back to the SMS server, either to be forwarded to the location server, or to a network element or device that submitted the location query to the SMS center in the first place. Assistance data may additionally be delivered to the mobile communication device via the SMS port.