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On the Google Cardboard site it says it should be compatible with most Android phone with Android 4.1 or higher. I have an LG Volt, and Android 4.4 phone with a 4.7” screen, and it is a good physical fit. However, the motion function won’t work for some reason, which means that you can’t really do anything with Cardboard. The cost is pretty low; I’ve seen some kits for around $20. Perhaps I’m just unlucky, but Cardboard definitely will not work will all devices, even some that are 4.4 like mine.
Note that I have only tried the official Google Cardboard app. I need to try some of the others and see if they work.