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I have been doing something similar. I have a SoneyEricsson T68i phone and an iPAQ 4155. For some reason the 4155 has a difficult time connecting to the T68i via Bluetooth unless the phone is in Discoverable mode. (I don't know why, my 2210 never has problems connecting.) Since there is no way to keep the T68i in Discoverable mode for more than 3 minutes, I would have to manually put the phone into discoverable mode every time I want to connect, which is hardly convenient.
My work around is to use Running Voice. In the morning I start Running Voice, turn on Bluetooth Discover on the T68i and establish a connection, and then use a hardware button to turn off the screen. Since Running Voice keeps the Bluetooth connection open, I can then just put my phone away in my pocket and fire up a GPRS connection from the phone whenever I want. Battery life doesn't seem to be too much of a problem when doing this, unless I am doing a lot of GPRS stuff. I have gone with long periods of time maintaining a GPRS connection and haven't run into the Pocket PC closing the GPRS connection, however I do tend to have problems GPRS goes away while the phone/Pocket PC thinks it's still connected.
(BTW, if all I wanted to do was turn the screen off I could just use Windows Media Player to do that. However, I also like the phone features that Running Voice provides, providing some of the Phone Edition functionality to my 4155.)
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