It really depends on how you use the device. I keep music, lots of apps (some quite large), and maybe a video or two, and 16GB would not be enough. I expect this to be even more of an issue with the larger screen and its potential. My wife uses the phone for texting, calling, and the occasional picture (she's one of those people who like to use the iPad for photography because of the larger "viewfinder"). She probably uses only 3-4 apps. She has a 32GB model, and it's not even halfway full, despite never clearing out txt/iMessages (she has some dating back 3 years), photos, etc. She just has a different usage pattern than most of us here on the site.