Backbone has announced iPhone 15 support for its new and existing USB-C mobile controllers through universal compatibility between Android and Apple devices.
Backbone One - Xbox Edition - USB-C (iPhone 15 & Android)
Backbone gen 2 ??? : r/Backbone
Backbone One Mobile Gaming Controller for Android and iPhone 15 (USB-C) - Xbox Edition
Backbone One Review: An iPhone Controller We Love
Backbone Bb-51-b-r
Backbone One Controller Update Will Support iPhone 15 USB-C - CNET
Best Xbox Cloud Gaming Controllers and Accessories in 2024 - CNET
Backbone One Controller (with Lightning Connector)