Checkout lanes in stores are famous for opportunities to practice patience. They don't have to be, not according to Walmart. Not if you have its futuristic Scan & Go app. Sadly, while that app has actually been in existence since 2013, it only existed for iPhone users. That changes today with Walmart finally rolling it out to Android users to enjoy skipping lines. That is, if you live near the one and only Walmart branch it's currently working in.