Change Default Phone Number Format
To access this dialog, choose Setup > Firm > Preferences tab, select a format from the
Default Phone Number Format
field, and click Enter. The format you select will be applied any time you add or edit a phone number.
If you select any default format other than None, you will be prompted to apply the format to existing phone numbers. If you click Yes, all previously entered phone numbers are updated with the selected format. If you click No, all new phone numbers you add or edit will have the default format applied to them, but previously entered phone numbers will not change to the new format.