How to make a Contact Poster in iOS 17

Apple officially released iOS 17 into the wild on September 18. The new feature, Contact Posters, allows you to create your own digital calling card that pops up on other people’s iPhones when you call them.

This is a companion discussion topic for the original entry at https://www.engadget.com/how-to-make-a-contact-poster-in-ios-17-153026970.html