Android smartphones get operating system updates, usually only with delays, if any. This is due to complex interplay between Google, the smart phone manufacturers and providers. There is little remedy: Creating Self-hand, just buy the Nexus models from Google – and in our table to see which manufacturer advises the customer on the longest.
For a cell phone you need not really a fix, you might think, because you have it so chosen because of existing features, and not because of any future resulting from the purchase were not even known. But the demands of smartphones are higher: sometimes desirable features are added, sometimes require a new version of Android apps, and sometimes you have a bug can be eliminated.