21.   Ericsson is already selling so-called dual-mode phones that can be used in both analog and digital cellular networks.

22.   Even developing nations like Chile, Africa and Brazil are deploying sophisticated digital cellular networks.

23.   InterTrak combines the universal coverage of the GPS with the national cellular network to provide its wireless tracking service.

24.   It has struck alliances with US West, Bell Atlantic and Nynex to build a coast-to-coast domestic cellular network, and it continues to expand abroad.

25.   Mobile cellular networks cost more to build, but their growth has shot past that of hidebound and state-owned fixed-link services.

26.   Motorola Inc. will likely announce today it will build a digital cellular network in Japan for two Japanese companies, a published report said.

27.   Not all cellular networks have the same reciprocal agreements.

28.   Nynex also formed a wireless telephone alliance with Bell Atlantic, US West and Air Touch Communications that will try to build a nationwide cellular network.

29.   Others rely on upgrades to cellular networks.

30.   PHS uses wireless connections to regular telephone lines to relay calls, unlike the network of special exchanges needed for a cellular network.