21.   PCS provides wireless voice and data services, as cellular systems do.

22.   Schmitt favors GSM, a digital transmission method widely used in European cellular systems.

23.   That combination is still novel, though most cellular systems are in the process of adopting comparable technology.

24.   That view was echoed by Air Touch Communications, which operates cellular systems in California.

25.   The Czech government plans to issue two licenses for the Global System for Mobile, or GSM, cellular system.

26.   The counterfeiters then reprogram the pilfered codes into other phones, tricking the cellular system into billing to legitimate owners like Hood.

27.   The ruling narrows the field of competition to run cellular systems in competition with service now provided by state-controlled regional units of Telecomunicacoes Brasileiras SA.

28.   The preliminary ruling would narrow the field of competition to run cellular systems in competition with service now provided by state- controlled regional units of Telecomunicacoes Brasileiras SA.

29.   US Unwired would use the funds to acquire additional cellular systems and expand its existing systems, the SEC filing said.

30.   Whatever the quality, the new digital system can carry vastly more traffic than the current cellular systems.