 There are several states currently participating in this, and you just need to contact your local DMV or head to TSA.gov to see if yours is one of them. If your state is, then to use a digital ID, you add your state-issued driver's license or identification card to your phone using a TSA-approved digital ID app or to your digital wallet. This ID will be used at the TSA screening point in place of your physical driver's license and boarding pass. A picture of you will be taken and compared with your license.