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UPDATE August 19, 2008 11:22 GMT+11: This article has been superceded by an update with more permanent URLs: International Mobile Number Validation PT II

Validating mobile phone numbers in international format isn't all that easy. Numbering plans are disparate and constantly changing.

I've come up with a parseable file format which is published here:

http://www.workingsoftware.com.au/mobile_numbering.txt (ed: This link is broken, an updated link is available in the follow up post International Mobile Number Validation PT II)

I've written a class file in PHP (5 only) that reads this file and allows you to validate a number:

http://www.workingsoftware.com.au/mobile_validation.class.php.txt (ed: This link is broken, an updated link is available in the follow up post International Mobile Number Validation PT II)

There's documentation at the top of both those pages I won't bother repeating here.

I think the only way we can make this work is to have it collaboratively maintained. I've proposed that the project be hosted at http://www.kannel.org.

Please feel free to contact me or subscribe to users@kannel.org if you would like to discuss this further. Together, we can validate!