If you send a text to a landline, a lot of providers will convert it to a phone call using some sort of text-to-speech API. I've done this by accident on older

If you send a text to a landline, a lot of providers will convert it to a phone call using some sort of text-to-speech API. I've done this by accident on older cell phones when I'd add someone's landline to a text message instead of their mobile number. This sounds like a nightmare scenario though for this poor chap and his family (and his dentist).