This is the biggest hurdle. Most essential apps—including WhatsApp, YouTube, banking apps, and Instagram—now require iOS 14, 15, or higher. You will find that the App Store will simply refuse to download the tools you need to function in modern life.
If you are a tech enthusiast looking for a "mint in box" piece of Apple history for a display shelf. buy brand new iphone 6
There are only two scenarios where buying a "new" iPhone 6 is a good idea: This is the biggest hurdle