What's the longest possible worldwide phone number I should consider in SQL varchar(length) for phone

Question

What\'s the longest possible worldwide phone number I should consider in SQL varchar(length) for phone.

considerations:

• + for country code

Answer 1

In the GSM specification 3GPP TS 11.11, there are 10 bytes set aside in the MSISDN EF (6F40) for 'dialing number'. Since this is the GSM representation of a phone number, and it's usage is nibble swapped, (and there is always the possibility of parentheses) 22 characters of data should be plenty.

In my experience, there is only one instance of open/close parentheses, that is my reasoning for the above.