My phone is hardly EVER on ringing mode, probably the only few hours that I am on the road.
Other than that its on silent, though I know whats happening on the screen but I seldom do anything about it. Mostly I read a book, play a Multi-player FPS game on the PC, chat with someone around me or go outside and fiddle around with motor cars. 
No phobia for me as such. Though when I didn't have a smart phone or a tablet, I bought one, android, spent around 5 days or so with it and after that I really didn't know what to do with it anymore. Its been lying around here n there ever since.
Then I didn't have a smart phone, I got one, this time an iOS device.
Same happened, after a week, I hardly open an app on it. My favorite is Vine which is sort of a time pass. Other than that, no phobia.
