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My data connection is always on. It's also always dormant (gray arrows) - except for imap email check every hour on 2 accounts, and weather updates every 2 hours, and whatever else I do on the network. Unless something specific happens (like I go into the black hole of coverage @ work) to kill my EVDO and voice link, the connection is always on but dormant.
A connected, dormant EVDO session DOES NOT cost you anything in power. Not a single milliamp. In fact, it costs more power to re-connect to EVDO then to start up a dormant connection.
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