I have zero signal at work due to the building being a huge metal frame and metal mesh on the windows.

This means I cannot SMS anyone. It also means increased productivity as I don't bother looking at my phone to see if anyone has texted me.

I can get WiFi at work and use Internet IM/communication apps but in all seriousness, I am there to work and putting my phone in my pocket on airplane mode is actually far more beneficial than you think.