r cellular telephony. Rapid growth is beginning, and at least two companies are competing with significant market share. The largest company is based in Hong Kong, which is now part of the People's Republic, and much of the equipment production is occurring in factories on the mainland. In the third world, those nations that are largely agrarian but are developing technologically and economically, wireless telephony is still a growth market, often in its early stages. In the fourth world, those nations and regions that are largely agrarian or are the homes of indigenous tribal populations, cellular telephony is a future market, yet to be developed. Cultural customs vary greatly, and this needs to be taken into account. There is a thriving wireless service in Pakistan based on the idea that those who can afford wire- less service themselves will make money by allowing others to use the phone on a per- call basis. The billing model is set up to support multiple users per user terminal. In rural India, where television has been accepted as a communal service for decades, there are now plans to deploy satellite or wireless telephones, one per village. In these parts of the world, there is often a very great difference between urban and rural lifestyles. In many nations, cellular service has been focused only in urban or metropolitan areas. This may begin to change, and coverage for large regions of some countries may become important. In addition, we must be able to estimate the demand for wireless local loop (WLL). WLL will be used as an alternative to traditional landline access methods, but the user will view the service as landline service. Thus we can use methods for estimating land- line demand when estimating WLL demand. However, we may allow a higher blocking rate for WLL than was allowed traditionally for landline service in North America and Europe for reasons described in Sec. 3.2. 31.1.2 Calculating demand Once we know the number of subscribers and their peak-hour usage patterns, we have the basis for a t