https://www.caesars.com/mobile-sport...FMobile-Sports
Go to the above link, download the app, then click the forms link, print them out, fill them out, and bring them to any Caesars sportsbook in Nevada.
At that point you will be activated for real money sports wagering from your phone, provided you are physically standing in Nevada when doing it.
I will probably do this so I have an extra set of lines to use on games when in Nevada.
Right now I use 3 offshore books for my sportsbetting.