Once an auto-attendant has been 
activated, whether or not a phone number has been assigned yet, it can no longer be edited. This is because the Auto-Attendant route builder saves changes in real time, and we don't want you to accidentally break an active call flow, even temporarily. See also: Edit an Auto-Attendant
If you don't need to make any changes but you do want to see how it's set up, open the auto-attendant in 
View Only mode. View Only allows users to open an auto-attendant that is Active or Live without the risk of making changes to a live call flow.
View Only Mode
Locate the auto-attendant you want to view, and click View Only on the right to open the builder. Whether an auto-attendant is activated with or without a phone number, the functionality is the same:
- The title bar says (View Only).
- The ellipses that normally indicate a route can be edited are gone.
- Users can still view routes, but the settings are grayed out and cannot be edited.
- Instead of Cancel and Save buttons, the route will have only a Close button.
Examples
Here are some examples of what it looks like:
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