All Administrators and Standard Users can use the iOS and/or Android versions of the app.
There are no special requirements beyond downloading/installing the app and signing in with the same credentials as on the Remote Services/Total Connect website.
Panel Only system users cannot log into Remote Services and can only operate the system control panel at a given location.
For more information on the different types of Remote Service user, see the FAQ Why are there different types of users? What are they?