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On a normal cell phone the yahoo app uses a "magic sms" to tell the app to start and download a new message. On the wx it uses the data connection - no sms is used by default if you have a data connection. There is an option in the program that lets you say if you want to use sms if there is no other way - it normally selected but I turned it off. I had it for about 12 hours with it syncing ever two minutes of so; so I was really worried about a huge charge from sprint (I had no sms plan at the time) but nothing came. So all is well I guess.
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