"Do Not Disturb" not working

The phone has to be locked

 

I was really hoping that Do Not Disturb would provide a way of blocking unwanted calls while I'm at work. I use my phone for setting timers (otherwise my time management is terrible) and as a remote control for Keynote presentations, so locking is a no go.

 

Remember the new Samsung advertising? We will get it for sure... next year

 

Airplane mode?

 

Would the Keynote remote still work?

 

http://madeforpeople.net/2011/4/8/using-keynote-remote-on-your-iphone-in-airplane-mode.html

Keynote works over wi-fi so if you turn on airplane mode and then manually turn on wi-fi it should work

 

Thank you!