Would it not be great to have an option to text short messages such as door code, check in/check out time reminder.
It would indeed! And that's planned for future development. The idea is that there will be Email Templates (what we have now) and SMS Templates. In your triggers, you'll be able to specify a SMS Template to send at a trigger instead of (or in addition to) an Email Template. It's gotten pushed back a bit because of current wok.
Looking forward to this as well. Speaking for my condos, it appears people prefer to text VS call or email.
Personally, I like texting because you still have a "paper trail" and it's easier than email.
I also plan to dabble in bulk messaging (similar to email lists) so potential guests cell phone #s are just as valuable to have as their email address.
Make sure to read this:
https://www.ownerrez.com/blog/product-updates-hosted-header-styles-menu-buttons-links-condensed-view-fixes-pool-icon-sms-sees-limited-daylight