Hello @CarlW96 ,
At this time we don't have an in-house texting or SMS system. There are several SMS integrations developed by 3rd parties, which can be searched for in the Integrations Marketplace. Please also keep in mind that our system no longer uploads contacts without email addresses, so if your account is old enough to have any, then they were grandfathered in. They are considered inactive, and thus are not counted toward your Active Contact total for Billing purposes.