Phone Layouts - how to design and tips?

I am not sure if there is any tips on how to develop the phone view?

See here

Hi all

I created a report on Power BI desktop & also a mobile layout view.

The report is published online to the Power BI service and I can view both the “Reading view” and “Mobile Layout view”

However the problem is when viewing the report using mobile phones or other colleagues phones, we are NOT able to view the mobile layout version.

The version viewed on the mobile phone is the desktop layout reports

Please can I get any suggestions/ advice - Many thanks