Family portrait of the 8 generations of iPhones Top row runs the older iOS: iPhone 3GS, 4, and 4S Bottom row runs the latest iOS: iPhone 5, 5S, 6 Plus, 6S Plus, and 7
My iPhone collection is constantly growing. When you lay them down like this with their boxes, it provides me with a nice view of how the technology is evolving. As with all things, though, old devices simply ceases to be supported by the manufacturer. The three iPhones at the top no longer receive any major iOS version updates and are stuck in their time. The new member of this is the iPhone 4S, topping out at iOS 9.3.5. I expect iPhone 5 to join this group next year because, along with iPhone 5C, it is the last in the line of 32-bit iPhones and iOS 10 visually warns about an app that's not 64-bit.
iOS updates or not, all my devices are kept in good working condition. So I brought them out for another annual round of tests. For this year's tests, devices from iPhone 5 to 7 had iOS 10.0.1. 4S, 4, and 3GS had 9.3.5, 7.1.2, and 6.1.6, respectively. Last year, devices from iPhone 4S to 6S Plus had 9.1. Let's take a look at the boot times.
Unless it's an old device that's feeling the weight of a new OS, newer devices tend to have a quicker boot time. Strangely though, iPhone 7 does not boot up as fast as its predecessor, and this was repeatedly observed. Perhaps this is due to the tested device having a large, 256GB storage and the system taking its time to test its integrity.
As far as changes go, iPhone 7 is doing a big jump we've come to expect when the major number changes (e.g. iPhone 5S to iPhone 6). It just happens to be that Apple was happy to keep the general shape and size for the third generation. Personally, this seems like Apple is happy with these design decisions instead of being lazy. After all, Original iPhone style survived three generations as well until thinner design became feasible.
In any case, the packaging of the iPhone 7 is also largely the same as the previous 4.7" iPhones. Two major differences, other than the phone itself, are the photo of the iPhone on the box and the bundled EarPod earphones using the Lightning connector instead of the 3.5mm earphone jack. 3.5mm to Lightning adapter is included for those who need to use the existing earphones.
Bottom area: iPhone 7 (top) and iPhone 6 Plus (bottom)
Speaking of the earphone jack, iPhone 7 indeed no longer has one as you can see here. This has been the source of much online drama, but I expect it to simmer down as time goes on, much like when Lightning connector itself was introduced with iPhone 5.