From the Project Home, tap the 3D Models icon, and select a model from the list of models available on the project. When you select a model, you will be shown the comments associated with it, along with the option to download it. Tap the download button to view the model on your phone.
When you open the model, you can see the various navigation options and browse the model on your phone. Tapping the "Load comments" option downloads the comments associated with the model.
You can see the list of comments and also navigate to the camera view at which the comment was created using the comments panel.