Your phone should switch freely between wi-fi and cell connection.
But yeah I'd love for a phone manufacturer to tell facebook/instagram to shove it sideways deep, deep, deeper in their anal cavity. What other thing have people ever bought/sold/traded/bartered for that comes with shit you don't want and can't get rid of that negatively affects the performance of the thing? And then did it again? And everyone else was doing it too?
Hey at least they didn't just take a chunk of your storage space overnight and fill it with a U2 album.
Yet.