Summary
When logged in to the mobile app, the app shows only that tech's route. If you are an admin and don't have a route assigned, you won't see any routes.
Key Points
This is by design in the original Fieldwork app
Use the Fieldwork Office app to see other routes
This is by design as the mobile app is a reporting tool, the browser app is the managing tool.
To see other routes use the Fieldwork Office app.
For more information, see Fieldwork Office - Getting Started Guide