Now I have 'dumb' phone, I only miss GPS and flash light. I still do read twitter, but only every second day together with RSS and log files. My IM has constant status 'Do not disturb unless it is on fire'. Only paying customers have now privilege to interrupt me, we mostly schedule meeting anyway.
60% raise in productivity, I am less tired and I even got time to read a book.
This is about where I was too. Bought a car GPS which is good enough for me and has no monthly service fees, and mounted a couple flashlights inside my car.
The first few weeks were pretty tough; life without GPS made it an absolutely requisite to study the route to your destination before departing, and I did have a constant urge to check a device to see if anyone "needed me" yet. This feeling became negligible after the first month, to vanishing entirely by about three months in.
Sometimes, it helps to gain perspective.
life without GPS made it an absolutely requisite to study the route to your destination before departing
I've found this has helped me learn more about the layout of the towns. When I follow GPS, I may as well be in a maze with the lights off- I get to my destination, but I don't know where I am or where anything is.
I got my phone stolen a while back and ended up using a simple phone for a few days. It was amazingly refreshing to not constantly check email or read "news" when bored. Firing off quick emails all the time isn't any more efficient, and really detrimental to my mind. Unfortunately, I can't seem to convince other people to pace themselves.
Get a low-end Android phone and connect it to a separate email account (for travel documents or whatnot). Maps and Wikipedia will function, but it'll be generally useless as a time-wasting device.