How would you best word a "No Internet" sign for your house?

I asked a question about my husbands obsessive internet use since he got a smart phone 10 months ago. Some one suggested putting up a sign. I don’t think a sign specifically directed to my husband would be good, but there are times when we have company and some of them tend to lose themselves in their phones the whole time, when they’re supposed to be visiting.
It’s no different than if you invited someone to your house, and they got a book and went to another room to read the whole time, or went to another room to watch TV by themselves, ignoring everyone else. It’s just rude.

Sometimes guests will answer their phones in the middle of the gathering and will be holding these loud 3rd party conversations, competing with the “noise” of everyone talking around them. That needs to be addressed, too.

How would I word a sign reminding grown-assed adults to mind their manners?