A.13. Phone numbers

13336669999, +13336669999, 1 (333) 666-999, all of these are valid and some servers store the country code, area code, and actual number separately.

While this format generally works, there are instances where simple concatenation of country code, area code, and actual number may not work correctly. For instance, a phone number in Tokyo, Japan(e.g. 03-3580-3377) may not be dialled correctly by using +810335803377. The area code (03) must be translated to (3) so that the mobile device omits the extra (0) and dials +81335803377. These types of area codes are quite common for many Asian countries. It would be ideal if software applications can interpret these type of numbers and automatically convert the phone numbers accordingly. Also, the display of the phone numbers should be rendered according to where the end-user is. (e.g. If the user is in Japan, the number 03-3580-3377 should be used, but if the user is outside of Japan +81335803377 should be displayed).