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Formatting phone number has never been an issue, the only thing that you need to do is, use few string functions and you can convert it into any format. But what encourages me to write this article is that we can format the phone numbers in any format using only one function, i.e. Format (introduced in SQL Server 2012).
One approach would be to store the phone number in a bigint field and the extension in a separate smallint field. The int datatype is not large enough to hold the number and area code, while the next available number, bigint, can easily store over 18 digits. It is the same story with smallint.
The money data type is a numeric data type which accepts negative numbers. Phone numbers should only be positive, so let’s add a rule to prohibit negative numbers. In SQL Server 2005, this looks like:
Almost every business database has fields and records to store contact information. Every contact has at least one phone number, and most people have several. Between home, work, fax, cell, and pager numbers, it is not uncommon to have five or more numbers for a single individual.