This is a problem across ALL WM5 devices, not just the i730/i830. This isn't something a registry tweak will change or fix, as it's hard coded.

Hopefully WM6 will add a few more in, as this is a complaint across all WM5 devices...

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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