How to find out what is the maximum version of android that can be installed on a smartphone?

Question

Android

For example, iphone 4 supports a maximum of ios 7.
And how to determine for android smartphones?

Answer 1

The phone does not stop updating because it "does not support" the new version of Android, but because the manufacturer stops releasing updates for it. I suspect that at the time of the release of the model, the manufacturer himself does not know how long it will be updated.

Answer 2

I usually google on request manufacture_name model_name 4pda, and see what firmware is on the list

Answer 3

Look at the manufacturer's website, he must write to which versions the smart will be updated. I don't know any other way.
For example, this phone:

Android JellyBean 4.3 ( will update to 4.4 KitKat ) with ASUS ZenUI.