Register for the promotion via the link above and then follow the instructions to download and register for the app and you’ll get 500 United miles within 2 months.
I registered and downloaded the app when it was offering 1,000 miles a few weeks ago and the miles already posted. I created an account from the app, but I did not enroll any bank accounts or credit cards to get the miles.
United miles require activity every 18 months, so this will extend the life of your miles for another 18 months. Chase United Explorer cardholder’s miles never expire for as long as they remain a cardholder. They also get excellent benefits including vastly expanded saver and standard award availability, free checked bags, priority boarding, United Club passes, primary car rental insurance, and elites also get upgrades on award tickets as a benefit of having the card.