The Phone Mask in PestaRoo automatically reformats an entered phone number into this style: “(XXX) YYY- ZZZZ”. This is a great time saver.  It also turns the entire number red if you enter insufficient digits. This captures errors immediately.  What about phone numbers with extensions? These, too, are covered. An extension is shown with an “x”, followed the extension itself.   Australian users have a separate appropriate phone mask.