his kind of pricing pressure to encourage subscribers to use their cell phones during off-peak times. Since all the cellular providers are likely to have the same busy hour, there is little differentiation among them in time-of-day pricing. However, not all wireless systems have the same geographic cost issues because their cell layouts are different and their transport networks are different. Thus a mild price incentive on the part of one provider for using wireless service in targeted areas may produce significant increases in subscriber demand in those areas. We can use a lower price to encourage usage in targeted areas. We also can use other promotions similar to how we treat off-peak usage. We can give away free minutes as part of a promotion, or we can sell minutes in targeted areas as part of a subscriber package. In designing these packages, we can seek business or residential customers by customizing the packages to offer services that meet different needs at acceptable prices. Sometimes it is possible to charge a business substantially more money per month for a service similar but not identical to residential service. For example, we might allow more daytime minutes, or we might allow people in different households to share the same plan at a surcharge. We also might be able to tie third-generation (3G) services, wireless data, and multimedia service (MMS) into the promotion package. 45.2.3 Mix of services The capacity of a 3G CDMA system is highly dependent on the mix of services. A CDMA carrier may support hundreds of voice callers and only a few high-rate wireless data users. We would hope that higher-usage services would be able to command an appro- priately higher price in a competitive market. It is not always obvious which services are using the most capacity resource. Some services use more resources than others, but some of those resources are more critical. A bursty data user may use the same number of bits as a lower-rate, steady- stream data user, but maintaining enough spare capacity on th