These discounts are designed, no doubt, to educate people about the different ways they can spend with Android Pay. Most Brits will know they can use their phone to pay at physical stores -- they'll have seen iPhone users doing the same with Apple Pay. But it's possible, or rather likely, that users are less familiar with Android Pay's second role as a digital wallet. Android Pay Day could, therefore, be an important tool for raising awareness among the Android-wielding public. Success will ultimately hinge, however, on Google promoting the monthly rewards effectively -- if no-one knows they exist, they won't have an impact on adoption.