GSM-based Systems
Proximity Marketing via SMS relies on GSM 03.41 which defines the Short Message Service - Cell Broadcast. SMS-CB allows messages (such as advertising or public information) to be broadcast to all mobile users in a specified geographical area. In the Philippines, GSM-based proximity broadcast systems are used by select Government Agencies for information dissemination on Government-run community-based programs to take advantage of its reach and popularity (Philippines has the world's highest traffic of SMS). It is also used for commercial service known as Proxima SMS. Bluewater, a super-regional shopping centre in the UK, has a GSM based system supplied by NTL to help its GSM coverage for calls, it also allows each customer with a mobile phone to be tracked though the centre which shops they go into and for how long. The system enables special offer texts to be sent to the phone.
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