* There are two main ways.
* The first is called an email-text gateway.
* Essentially all the major mobile carriers give their customers special email addresses.
* Anything sent to that address gets converted into a text message by the carrier.
* The second way is for the company running the app to also be a carrier.
* For example I have Google Fi.
* I can send text messages via an app on my computer.
* Google takes the messages I type into the app and then they send them out via their carrier network just the same as if I had composed the text on my phone.
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