ADC
Broadband networking equipment and services.

Tustin

Telecommunications

25 - 99

Cox Communications
Nationwide cable television operator.

San Juan Capistrano

Telecommunications

500 - 999

SBC Communications (Pac Bell, Cingular)
Internet access, wireless communications, cellular paging, and telephony.

Anaheim

Telecommunications

5,000 - 9,999

Sprint PCS
Digital, PCS network provider.

Irvine

Telecommunications

unknown

Verizon
Telecommunications firm.

Anaheim

Telecommunications

1,000 - 4,999

Verizon Wireless
Verizon Wireless' Mission - “To be the leading provider of wireless communications and information services and the recognized market leader.”

Irvine

Telecommunications

1,000 - 4,999