[varbent]

To get the phone app to stop rotating simply do the following steps:

-create a new event
-Choose to edit the new event, name it whatever you want.
-Under the 'Application' tab, double-click the "Phone" listing. the word "Phone" will show up in the textbox at the top
-Under the 'Orientation' tab, check only "Portrait"
-Under the 'Actions' tab, check "Rotate Screen"
-Click Apply
-Back at the list of events, choose to promote the new event anywhere above the already created event called "Rotate"
-For the new event, make sure the 'Orientation' option is checked via the context menu for the new event.
-click apply.

That's it! Now your dialer pad and in call/call status screen will not rotate. Also, if you want your incoming call screen to not rotate either (my preference), do the same steps above but choose "Call Incoming" instead of "Phone" under the 'Applications' tab.

Hope this helps!