First, wireless is mobile, devices connect, users interact. Next, go with the flow it is proper Netiquette. Do follow the culture around you.
Culture of Mobile
When using wireless devices in public users must follow the culture of the crowd as well as online users. Put devices away. Given, not acceptable to be used at the time.
At hotspots smartphone Wi-Fi use is always acceptable. We use tablets at there too. Laptops, occasionally. For some that is the occasion.
Netiquette For Mobile
Follow the cultural norms of the crowd around you because humanity comes first.
To mobile rules.