Some are, some aren't.
First thing you need to know is the operating system - Apple or Android or Microsoft or a minor player.
Second, if Android, is it Google, Amazon, or someone else.
For example, it's not easy to load Google apps on an Amazon device - it can be done, but it takes more time than I've been able to give it.
I'd suggest getting a junior high student to advise you the first time through. That's what I did.