Whatever your smartphone preference, the truth is that the major smartphone operating systems are all pretty darn good across the board. I've been toting various modestly-equipped Android devices for the past two years and have been generally pleased except for storage management: on every device the primary (internal) storage would eventually unexpectedly fill without explanation. I read manuals, combed forums, migrated apps, moved photos, cleared app data and cache folders all to little avail. Finally I identified the culprit behind the disappearing storage and discovered it had nothing to do with my devices or with the Android operating system...