Its really weird. Upgraded my Pre-2 to 2.2.4 and all is OK. Updated my wifes and she cannot dial any number longer than 4 digits. It just ignores the number.

I put her SIM card in my phone - all OK.
I put my SIM card in her phone - no joy.

Put it back to 2.1.0 - all OK.

Reflashed 2.2.4 with her profile - no joy.
Created a new profile for her - all OK.

So, it's something to do with her profile and 2.2.4. Has anyone seen this before? At the moment, we are using the alternate profile and rebuilding all the apps and contacts etc.