Hello!
There is no Navisworks App for IPhone, but you can use A360 Drive App for this: https://apps.apple.com/us/app/a360-view-cad-files/id874184071
and upload your NWD there.
I have found the following method to open (view only) Navisworks files (NWF, NWD, NWC) of all types on iPadOS devices.
1. Update your iPadOS Device to the latest available iPadOS version
2. Download onto the the iPadOS Device and sign into BIM 360 Glue with a Autodesk account (no license required)
3. Locate the file on the iPadOS Device in your chosen data management app (One Drive, SharePoint, DropBox, Google Drive, Files etc)
4. Choose to to share the file looking for the option that allows you to "Open in another app" (this may be a sub-menu or hidden in a contextual menu, try looking under the "..." menu(s))
5. Choose to open the file in BIM 360 Glue
You should now be able to open the file for viewing. Note: Performance may be limited depending on file size and iPad model.
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