I would always reccomend the OTP, especially since the app is free, and if you like the game and think you plan to play it for a long time with your friends!! I'm honestly not sure if it will prevent resetting your password or not though, it sounds strange, my gf n I go over to each others houses to play and don't have to reset it when we change locations. I have the OTP but she doesn't, but neither one of us have to everytime.