No, I'm not kidding. I always carry around my laptop and/or my tablet (which has no SIM support), so I only need a phone in my pocket to check the time (I don't like carrying anything on my wrist), send SMS and call people (people in my area are usually responding to those more quickly than on Skype, Facebook, Viber or whatever).
Then Google bricked it with the 5.1.1 update, so while waiting for the replacement to arrive I got a cheap Lumia 535 that I'm loving so far.
Fast forward one week, Nexus 5 replacement arrives, and updating to the latest version bricks it again (this time a soft brick :)
Having realized that Google is apparently packed with morons I'll stick with Windows Phone for a while. Looking forward to the upcoming Lumia 940 or the successor of the Lumia 1020.
If I'm working I'll be at my desk and easily reachable through many channels other than mobile phone. If I'm not at my desk it usually means I'm not working, hence not going to pick up your call or checking work email :) There are of course exceptions, I'm not an unreasonable jerk :)
Other than that I haven't missed it much. I spent way too much time browsing various sites with it, now I have more attention for the people around, and I actually read books.
I'm currently on Verizon, but this phone is GSM compatible too, and I plan to switch to TMobile soon (though, I've planned this for months. Inertia and all of that...).
I want to switch to the Ubuntu phone soon (BQ Aquaris E4.5) - does anybody have any experience with that?