baloofarsan said:
Some people think that going the "smartphone way" is going to make generations go away. Everything will share the same OS. The latest iOS (9.3.2) is compatible back to iPhone4S. That is four and a half year. Apparently it has problems working with the oldest iPhone. https://en.m.wikipedia.org/wiki/IOS_9
The new iOS10 coming this fall will drop compatibility with iPhone 4S!
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iPhone 4s will continue to get games and Apps even if it doesn't receive iOS10.
Most, if not all, Apps continue to be compatible with the last 2 or 3 iOS major releases. So the iPhone 4s still has 2 years of being perfectly usable after the release of iOS 10.
Not to mention, mobile processors saw a huge jump in perfomance since the iPhone 4s, these perfomance gains are about to slow down and smartphones of today will be usable for much longer.