The 20 GB for $20 Data Plus option is only available on the $28 /mo Base Plan and $65 /mo +Phone Plan.
Awesome! You'll #NeverRunOutOfData again! Just make sure to update the Circles.Life mobile app in the Google Play Store or the Apple App Store depending on your phone. Also ensure that the Plus was successfully subscribed. If successfully subscribed, you will have received an in-app notification and an email confirming your subscription.