I have an iPhone 6 I know its pretty old so can I install Kodi on it?
Yes, of course, you can without jailbreaking with just a few easy steps less than in a minute check here https://www.reviewsdir.com/how-to-install-kodi-on-iphone-or-ipad/
Have you got the guide? If not let me know. I'll help you to install it on iPhone 6.