A:AnswerYou can use the Apple - Lightning Digital A/V Adapter Model: MD826ZM/A SKU: 7007013 to hook up an iPhone into one of the HDMI inputs on the TV.
A:AnswerYou can purchase the Replacement Remote Model: NS-RCFNA-21
https://www.bestbuy.com/site/insignia-fire-tv-edition-replacement-remote-for-insignia-toshiba-black/6418140.p?skuId=6418140
A:AnswerYou do not need a Prime Video membership to watch YouTube.
Try the link below; you just need a free Amazon account.
https://www.amazon.com/Google-LLC-YouTube/dp/B07T771SPH
A:AnswerYes, this TV can be mounted on the wall, the VESA Mounting Pattern is 200mm x 200mm. When you purchase a professional installation service, you can add the Haul Away service for an additional fee.
A:AnswerYou can buy a wall mount that supports the VESA Mounting pattern 200 x 200 mm. Try the Best Buy essentials™ - Full Motion TV Wall Mount for Most 19–50" TVs - Black Model: BE-MSFM