Send form URL to respondents as text from our system and still remind them if the form has not been submitted?

Kindly note that every form has its unique URL which you can get following this guide.

Yes, you may send the form URL to respondents using any messaging method.

And yes, you could also set Reminder Emails to remind respondents of submitting the form. This is done by sending them emails.

Related guide: How-to-set-reminder-emails-for-your-forms

I hope I have been of any help.