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DonKarnage1 t1_itzgu8o wrote

If you're asking how a computer sends a text to a phone

The software is connected to a system that has an assigned phone number. When you send a message, the software handles it the same way your phone sends a text using it's assigned number. The recipients phone doesn't know (or care) how the message originated.

With everything being IP, there's not much difference between your smartphone and a "computer".

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