One or more ultra short-range cellular data beacons may be used for proximity detection of in-range client devices that utilize cellular data protocols such as LTE (Long Term Evolution). The ultra short-range cellular data beacons may complete an electronic handshake with in-range client devices. The in-range client devices may provide a client device identifier to the ultra short-range cellular data beacon as part of the electronic handshake. A time receipt of the electronic handshake, a client device identifier, and the ultra short-range cellular data beacon that completed the electronic handshake may be provided.