Greetings Dlawn,
Thank you for continuing to post questions in the Apple Support Communities!
To get Continuity for SMS and MMS set up, I would first suggest reading over the steps located in the attached article below to make sure that Messages is set up correctly on your Mac Mini and iPhone.
Your iPhone, iPad, and iPod touch need to use iOS 8.1, and your Mac needs to use OS X Yosemite.
- Sign in to iMessage on your iPhone, your other iOS devices, and your Mac using the same Apple ID.
- On your iPhone: Go to Settings > Messages > Send & Receive > You Can Be Reached By, and add a check to both your phone number and email address. Then, go to Settings > Messages > Text Message Forwarding, and enable the device(s) you would like to forward messages to.
- Your Mac, iPad, or iPod touch will display a code. Enter this code on your iPhone to verify the SMS feature.
Use Continuity to connect your iPhone, iPad, iPod touch, and Mac - Apple Support
If the steps above help to resolve this situation, please reply and let the community know how this issue was resolved for you. We are glad that you are part of the Apple Support Communities and can’t to hear from you more! :D
Cheers!