ach other. These devices can potentially all have IP addresses and can be a part of a sensing and surveillance network. They combine local storage capability, intelligence and communications capability. The relevance of these networks to cellular phones may seem tenuous. However, the proto- cols for ad hoc networking are well established and already deployed in a number of two-way radio system solutions SO the concept of cellular phones and mobile broadband devices inter- acting with these devices is at least plausible. 19.6 The Cellular Phone as a Bridge Between Multiple Devices and Other Network-Based Information The logic of using a cellular phone in any or all of the above applications is that the cellular phone provides a bridge to the outside world. Advantageously, of course, this is a toll bridge 5 http://www.rfidjournal.com/article/articleview/2436/. 6 http://www.rfida.com/apps/passive.htm. Making Telecoms Work with an efficient and robust revenue capture (billing) capability including pre-and postpayment collection. The technical challenge of using a cellular phone is that we need to support additional wireless systems and protocols that add cost and complexity to an already overloaded product platform. 19.7 Multiple RF Options Frequencies used presently include long wave (below 500 kHz), 1.95, 3.25, 4.75 and 8.2 MHz (typically used for antishop-lifting tags in retail stores), near-field communication in the 13 MHz ISM (industrial scientific medical) band, the 27-MHz ISM band, the 430-460-MHz ISM band available in Region 1 (Europe and Africa), the 902-916-MHz band available in Region 2 (North and South America), the 918-926-MHz band used for RF ID in Australia, the 2.35-2.45-GHz ISM band, a possible band at 5.4-6.8-GHz and/or the use of ultrawideband systems between 3 and 10 GHz. UWB was potentially appealing in that there was a very scalable relationship between bit range and range (low bit rate/long range, high bit rate/short range). The frequency band (up to 10 GHz) is also useful for microdevice form