A:AnswerYou can use an adapter like the Apple - Lightning Digital A/V Adapter - White
Model: MD826ZM/A SKU: 7007013 to connect an iPhone into one of the HDMI inputs on the TV.
A:AnswerHello Marne:
You don't need a digital converter box because this TV is digital. I installed my indoor antenna and scanned for channels and I have 58 channels, including some I have never heard of. I live on top of a large hilly area and may get better reception than most.
A:AnswerAfter buying this tv and setting it up, you do not need an Amazon account to use YouTube. I did have to download the app to the tv though. I was afraid I would need to have to have an Amazon account as it tries to force you to sign in or sign up for one.