If you are having problems making calls, and it says that the call failed, and if you redial and it works, most likely the dialparser isn't letting the dormant connection end quick enough.

Use this dialparser by SuperDave:

http://pdaphonehome.com/forums/showthread.php?t=72342

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-Michael
Need help setting up your i730/i830 or other WM2003/WM5 Phone, as well as the other hacks I have done, check out the MRailing Guides and Links