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My understanding is that you’re not going to find a self hosted solution that makes use of SMS (not counting email to SMS gateways) because sending SMS programmatically requires a SMS gateway those aren’t cheap (think of Twilio). You can find many options for app-based notifications (push notifications usually) and email-based notifications as a workaround.
I’ve unfortunately met people before who think those areas are just another parking spot, so honestly I wouldn’t be surprised if this was the real answer.