How to save money on a 4K TV or a mobile plan, screen-embedded fingerprint reader technology unveiled ahead of the iPhone 8 launch, Apple opens its public betas for iOS 11 and macOS High Sierra, we run our eye over the Audio Technica wireless Bluetooth headphones and the affordable Alcatel A3 XL smartphone while Netflix offers content with Dolby Atmos audio and we finish off with the Tech Guide Help Desk.