How did whitepages.com/txt create their texting form? (PHP)?

Kitty Juice

New member
Well, not the form. I understand that each phone has an email address assigned to each carrier, having said that, how does whitepages do it without asking for the carrier? I've been trying to create a PHP Texting service but haven't been able to make it super user-friendly. Any help is greatly appreciated!
 
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