T-MOBILE USA INC.

CEO: Philipp Humm.

Revenue: $21.35 billion in 2010; $21.53 billion in 2009.

Net income: $1.35 billion in 2010; $1.47 billion in 2009.

No. of local employees: 250.

Investor: Deutsche Telekom.

Headquarters: Bellevue, Wash.

Year founded: 1994, as VoiceStream Wireless.

Company description: Wireless telecommunications service provider.

Key factors for success: Value pricing, spectrum holdings, financial resources to operate in a high-cost business.

AT&T INC.

CEO: Randall Stephenson.

Revenue: $124.28 billion in 2010; $122.51 billion in 2009.

Net income: $19.86 billion in 2010; $12.14 billion in 2009.

No. of local employees: 3,885 as of Aug. 1, 2010, according to the San Diego Business Journal’s list of Largest Employers.

Headquarters: Dallas.

Year founded: 1983, as SBC Communications.

Stock symbol and exchange: T on the New York Stock Exchange. Company description: Telecommunications service provider offering wireless and land-line service.

Key factors for success: Market dominance, overall size (No. 12 on the Fortune 500), attractive product offerings (such as the Apple Inc. iPhone).

San Diegans have a front-row seat as AT&T Inc...

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