Let's face it, phones gum up, just as computers do. Rogue apps linger in the background, sucking up resources, flash memory gets bogged down, botched software updates leave that unpleasant feeling that something isn't working right, and this is valid for even the top-shelf handsets you can spend near a grand to buy. So, how often do you do a factory reset of your phone?
No, we aren't talking restarts here, which big software version updates do for you anyway, but actually resetting your device, and starting with it as a newborn child, curiously looking around and exploring the world.
Granted, it does warrant some total backup before you do it, but it can potentially get rid of the lot of problems plaguing your handset, and is sometimes even the only option when things go terribly wrong, so do you do it?