I want to add phone number column with below format:
1-121-343-6917, 434-5503 & 60-12-444 444
Used below method
=TEXT(123456 ,CHOOSE( LEN(123456) ,"0" ,"00" ,"000" ,"0-000" ,"00-000" ,"000-000" ,"0-000-000" ,"00-000-000" ,"000-000-000" ,"0-000-000-000"))
But this troublesome when you input information in EDIT mode rather than add NEW ITEM.
How I can use validation? Need help urgently.

