If mobile entry is enabled for your event, you absolutely can use your phone to get in! You can now use the SeatGeek app to enter hundreds of stadiums, arenas and theaters.
Venue policies for mobile entry can vary. Some venues do require that you print your tickets before arrival - so look out for instructions that will appear in the app and via email. You can pull up your order in the “My Tickets” section of your SeatGeek account to find out whether your tickets are good for mobile entry. Also, you can double-check the venue’s website ahead of time.