Uber has just announced that its Rewards program has been expanded to all U.S. cities. Initially introduced in nine cities late last year, Uber Rewards is now available in more than 100 cities across the U.S., including Detroit, Charlotte, Las Vegas, Milwaukee, Memphis, Minneapolis-St. Paul, Nashville, Portland, Sacramento, and more.

Regardless of what smartphone you're using (Android or iOS), you can enroll in the Rewards program directly from the Uber mobile app, which can be downloaded via the App Store and Google Play Store. Also, there's a Uber Rewards page that you can visit from desktop ...