I would recommend you to use LEO Privacy to boost your phone, you can have a try, I have used this app for 1 year. LEO Privacy Applock Hide Safe Android Apps on Google Play
If you mean that the phone hangs for a couple of seconds and then hangs up the call - I think I found your solution - http://www.wombatnation.com/2006/03/fix-for-treo-600-hangs My Treo was doing the same thing - so I just reseated the battery connection and it fixed my problem.
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