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There isn't one. This headache is legal, not Twilio

There is, it's called a USB 4G modem that plugs straight into whatever server you want.

Many carriers don't allow non-authorized devices like 4g modems to send SMS on their networks now. That's a recent change (last year).

So now you need a phone, maybe with USB Ethernet, and you write an app that exposes a REST API, and you call that?

Not a great solution, I guess, but ... zip-tie/hot-melt the hardware into a box with a fan and I guess it'd be mostly as reliable as a Raspberry Pi?

Is there a cheap Android phone with an external antenna socket still?