Welcome to the HP Forums, this is a great location to get assistance! I read your post and see that you are unable to print borderless from your iPhone. I would like to help you resolve this issue.
However, I will need a few details to provide an accurate solution.
- How is the printer connected, to the printer wireless direct or WI-Fi?
- Which app are you using to print from your iPhone?
Reply with the result of the above-mentioned steps, for further assistance.
Cheers .