Apple’s adapter has an HDMI 1.4 port - it can handle 1080p video but not 4K.
But not Xfinity Stream. That said, there are limitations. According to the internet, Netflix and Hulu work, too. I’ve tested it with Apple TV+, Disney+, Amazon Prime, CBS All Access and YouTube - it works perfectly. Once your handset and the larger display are connected, you can watch the video from many streaming services. It’s long been possible to connect your iPhone to second screen But do you really want another display for your phone? Ed Hardy at Cult of Mac thinks doing so has lots of uses, particularly when it comes to streaming.
