The Oppo Bubble is a smart second screen for your phone, one that can be attached and detached at will, connects wirelessly, and serves as either a selfie screen or a wireless camera remote. It’s the best version of this idea I’ve used yet, but also a frustrating reminder that it could be even better if only Oppo and other Android OEMs would get on board with Qi2 . The Bubble is a bit like a smaller — much, much smaller — version of Insta360’s Snap or the Dockcase Selfix phone case . It’s a