AT (NYSE: T) and T-Mobile US (NASDAQ: TMUS) are two of the three major telcos that dominate the U.S. wireless market, but each arrived at that point from different places.

AT is a former Baby Bell, a one-time regional landline company that's evolved into a wireless giant. It is the current market share leader, rising above the other telco that emerged under similar circumstances, Verizon Communications.

T-Mobile appeared in 1994 as Voicestream Wireless and was the only one of these companies to begin as a wireless company. Thus, the telecom stock did not have to radically transform its business as wireless became more critical.

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Source Fool.com