For me, the main reason to upgrade phones is to get a better camera, so I can take better pictures of my kids. Other than that, most of the features are &quot;nice to have&quot;. Don&#x27;t get me wrong, I like Touch ID, I like the big screen of the plus (but not the size and slipperiness of the phone), but nothing has been a compelling upgrade, other than camera improvements.<p>In many ways, this is a credit to Apple doing a great job. On the other hand, the real challenge with driving iOS upgrades is software. There&#x27;s no killer app that requires the latest hardware, unless you care about games and maybe a few drawing apps on the iPad.