Test1
{{If mobile|A mobile user you are!|You are looking at the desktop site}}

{{If mobile}}

You are looking at the desktop siteA mobile user you are!

{{If mobile/sandbox}}

You are looking at the desktop site / A mobile user you are!

Test2
{{If mobile|param1|param2|...|name3=value3}}

{{If mobile}}

param2param1

{{If mobile/sandbox}}

param2 / param1