That didn’t really help.
An SMS call doesn’t present to the system as a ‘phone call’, so it isn’t going to be processed as one. There is special Asterisk interaction that’s required to accept a stream of SMS data.
Installing ‘text to speech engines’ allows you to convert text (from files, for example) to be converted to “machine voice” files. It’s not really intended to turn a text message into a voice message, but if it did (and I suppose someone is going to get that working), the message would be dropped into something like a Voicemail box.
The only SMS “service” that comes with the system through the GUI is from SipStation, and I don’t use it, so I can’t really help you.
So,
isn’t really “a thing”. If you enabled Text Message traffic in Asterisk and your provider supports it, you can receive SMS messages, but “out of the box”, FreePBX doesn’t really do that (unless it’s part of COS [inside joke]). Because of that, there’s no way to install it, so uninstalling it is probably even harder.