Change default "Account Number" field to a text field

Change default "Account Number" field to a text field

I have not had this issue myself but have noticed that when I create a custom field for say, a company extension, the field must be created as a text field because a number field will automatically remove the "0" should the extension begin with a "0." -- Just a thought but I'm sure someone out there has account numbers that start with "0" or a letter.