BetMGM customers have access to mobile sports betting with the BetMGM Sportsbook app. And you can use the app in any state in which BetMGM is active.
If, for example, you downloaded the app in Colorado but are traveling to another state, you can place mobile bets with the same app. Simply create an account in the state you are located in (e.g. New Jersey), and, if necessary, manually change your location by scrolling to the bottom of the app.
You can visit the online sportsbook to see the states in which BetMGM is live.