Why Estimate Rocket?
Expanded client based communications
There new client SMS defaults as part of the SMS Template addition. New clients added through the Estimate Rocket user interface using the Create Estimate or the Create Client screen will now default to having the Can received SMS for Project Documents and the Can received SMS for Messages in Portal as enabled.
If you want the Appointment Reminders on as well that will need to be checked manually.

Other Related Articles
SMS Template Addition Overview
SMS Templates (Similar to email templates)
Add SMS Template to Follow Up Campaign