How long does service providers keep text messaging logs?

Millions of fingers scurrying over mobile electronic devices probably paused this week as news emerged of a trove of text messages containing flirty and sexually explicit chat between Detroit Mayor Kwame Kilpatrick and a top aide. Even those engaging in more wholesome dialogue would be wise to wonder: Do text messages disappear — like oral conversations — or are they permanently logged somewhere for potential retrieval — like e-mail usually is?
"I think people can feel comfortable we're not storing information that can later be used against them," Verizon Wireless spokeswoman Erica Sevilla said. "Unless you have something stored on your phone or on a recipients' phone, it does not stay on our network for a long period."
AT&T Inc. keeps text messages for up to 72 hours until delivery is successful, spokesman Howard Riefs said. If a message can't be delivered, it is removed from the system and can't be retrieved.
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