Is your mobile screen complete?

As a mobile app developer, there's a lot of things to take care before you decide your single mobile screen is complete and ready before you move on to the next screen.

Checklist

1. Design is consistent across various screen sizes.
2. Design is consistent across various OS versions
3. Form validations work as expected.
4. Validation errors are displayed as expected.
5. Text wrap or truncate as expected.
6. List down the data points on the screen.
7. Remove/add unwanted/missed data points in your model.
8. Data from API/Database is correctly set to model.
9. Data from model is correctly set to View.
10. All buttons/actions are handled.
11. Feedback on buttons/actions is handled.
12. API/Database response success/error messages are handled.

Feel free to add your own points in the comments...