Anon OpinTelephone numbers are not numbers. If a leading 0 is an important part of an identifier then it's different to its numerical value and so not a number.
Gary 
David Cantrell 🏏@WiteWulf @anon_opin but some do. For example, in Italy all geographic numbers start with a zero. Therefore they are not numbers. You also can't do meaningful arithmetic on them. Anyone attempting to store phone "numbers" in a numeric field is an idiot and should have their computer licence revoked.
Sabrina 🇺🇦🇹🇼🏳️🌈🏳️⚧️@anon_opin @WiteWulf @DrHyde The problem is that often spreadsheets (eg: Excel) *assumes* it’s a number and treats it as such. 😖 It’s not always the user’s fault.
Simon Hewison@lds @anon_opin @WiteWulf @DrHyde indeed. Using Excel for storing stuff when you don't mean to do arithmetic is user error.