> People living in California cannot relocate to NY just to use a different store. iPhone users can in fact buy an Android phone to escape Apple.
In what sense can people in California not relocate to NY but people with iPhones can relocate to Android? In both cases moving is possible but the cost is far in excess of the cost of the typical product you'd buy in the store.
In the very definite sense that Android and iPhone are brands of mobile phones available everywhere in the US, which you can buy any minute you want. You literally just need to buy a new one. That's not the same for the place where you live.
Even "just buy a new one" is laying out hundreds of dollars, if not over a thousand, to buy a $1 app. But then you also have to re-buy all of your existing apps and learn a new operating system. There may be apps that only exist on one platform, or services like iCloud that you would have a cost to transition away from. You may have friends who use iMessage and can't convince them to switch to anything else. It may force you into relationships you don't want -- maybe you don't want to give Google all your data and regard that as a significant cost.
That's normal in the world of software. There are thousands of titles that are Windows only. To use them you need to buy a PC with a windows OS, even if the software you want to run is $1 or free. The same applies to macOS or even Linux.
In what sense can people in California not relocate to NY but people with iPhones can relocate to Android? In both cases moving is possible but the cost is far in excess of the cost of the typical product you'd buy in the store.