I've been running a candy bar for about 6 months in conjunction with a smart phone (work and personal sims). I did this as I got tired of having a smartphone on 5% battery when I needed to make/receive an important call. I now forward the smart phone number to the dumb phone so I'm always available on both numbers. This way I'm always available for calls and have removed the low battery stress from my life. The downside is getting texts on the candy bar. Using keypad is a pain so I tend to call people rather than text or give yes/no replies to anyone not on a messaging app like hangouts where I can text via the smartphone.
I can really recommend it. Also on a side note I feel like I'm leaving the world behind when I only take the dumb phone out.
I should have added that I was faster and didn't even need to watch the keyboard. There was that short period (where phones were acceptable for kids and there were no real smartphones yet) where kids in school were texting blind to each other under their tables (peaking only to read of course).
Depends which part of the world. I don't do it often enough, but leaving the online part of the world behind would hardly be a bad thing. More time for the real world around you.
I can really recommend it. Also on a side note I feel like I'm leaving the world behind when I only take the dumb phone out.