What is the max and min digits for an international telephone number? (country code + area code + phone number)
E. 164 permits a maximum length of 15 digits for the complete international phone number consisting of the country code, the national routing code (area code), and the subscriber number.
The MAX member service toll-free number is 877-971-6300. What is the member service phone number? What is the member service phone number?
The total length of all phone numbers (area code and the phone number) is constant at 10 digits.
Land line numbers in Thailand are always 8 digits long (when the STD prefix of 0 is omitted); mobile and VoIP numbers have 9 digits and begin with a 6, 8 or 9.
, where the format of telephone numbers is standardized by ITU-T in the recommendation E.164, which specifies that the entire number should be 15 digits or shorter,
Source: http://en.wikipedia.org/wiki/Telephone_number
Also, check this other question on SO: What's the longest possible worldwide phone number I should consider in SQL varchar(length) for phone
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