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There is an sms bridge that already exists, however, I'm not sure how well it works.

If you're on iOS, there is also an iMessage bridge that exists.

https://github.com/matrix-hacks/matrix-puppet-imessage

SmsMatrix works decently well. However it does not support MMS messages (group messages or pictures).

Thanks,I didn't know about smsmatrix.

You could probably build one with Twilio. But otherwise it'd be on the bridge-owner to absorb the cost, so it'd almost certainly be a paid / self-run bridge of some kind.

I'm also interested in an SMS bridge