Since 2016, Amazon has been offering an ever-increasing lineup of Prime Exclusive phones – unlocked devices sold at significantly lower prices. There has always been a catch, though – they shipped with preinstalled Amazon software and had lockscreen ads. While you couldn't remove the apps, you had the option to pay a fee (depending on your device) to remove the lockscreen ads. At least that was the case until last week, when Amazon made the decision to remove the lockscreen ads for everyone, but increase the cost of every Prime Exclusive device by $20.
But what about the ones who have already paid to remove the ads? Well, they will get a refund. The good news came via e-mail sent to those eligible for a refund, notifying them they would get their money back in the next two to three business days. The refund will be in the form of an Amazon gift card equal to the fee you paid for the ad removal, giving you none other options than to spend the money on Amazon.
source: Android Police