The phones do stop working properly, e.g. unicode doesn't work, and unsupported android OS's aren't no longer developed, not to mention security updates. It's

The phones do stop working properly, e.g. unicode doesn't work, and unsupported android OS's aren't no longer developed, not to mention security updates. It's risky, especially in todays world where financial information is stored endlessly on a cell phone. 5 years+ for iphones make a very nice deprecation curve / alongside a viable resell market. It's nice to sell a 2yr old iphone for 70-80% of it's purchase price and then buy a new one and not have to worry about anything for another 5 years.