You can't have a game be free on one platform and cost money on another either, at least I am not aware of any such games. So either it is free/cheap everywhere or you don't release it on phones.

Edit: And by high budget games I mean games with a high development budget, not games that costs a lot to buy. Genshin impact is a AAA game that runs on phones, they invested $100 million to make it, that is what I meant by it being a high budget game.