Beigie did not say how widespread the problems were earlier in the day. In a previous e-mail he described the disruption as "intermittent."
On online mobile-phone message boards, people from Atlanta to Los Angeles described problems sending and receiving text messages and placing and receiving calls. On Twitter, where people post short messages, "T-Mobile" is at the top of a list of increasingly buzzed-about subjects.
Calls placed to the cell phones of several T-Mobile representatives could not be connected.
The outage could turn into the second black eye for T-Mobile, a unit of Deutsche Telekom AG, in less than a month. In October, a server failure caused customers with Sidekick-brand phones to lose much of their data.
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