Apple's iOS was designed as an operating system that is simple to install and is updated for all iDevices at the same time. Google's Android is an operating system that is modified a lot by mobile terminal manufacturers and each update to a new version of the operating system depends on the manufacturers. Practically, many owners of Android terminals find themselves unable to install a new version of the operating system without resorting to various hacks or tweaks.
The chart above PRESENTS as best as possible this situation and there we are explained how the terminals can install new versions of the operating systems. In the case of iPhone terminals, we see that the devices can install 3 major versions of the operating system and updates come automatically for all devices at the same time. In the case of Android terminals, manufacturers skip some versions of the operating system and in some cases do not offer the possibility to install the new versions of the operating system released by Google.
The bottom line? With iOS you have at most 3 completely new versions of the operating system and you can do the update once with everyone without depending on mobile phone operators.
