How do you disable/ remove the calling app?

In Salesmate, to be able to stop calling out of the app using Salesmate Calling. You will need to deactivate the app.

Here's how to do it,

Login to Salesmate as an Administrator
Go to Setup > Apps & Add-ons > Voice
Hit Get Started
You will see the Salesmate Voice & Text page
Hit Remove
You will be prompted to Confirm if you want to disable the Salesmate Voice & Text app
Hit Yes
Thus the calling app is disabled/removed.

In case you wish to reactivate the app follow here