Backbone has announced iPhone 15 support for its new and existing USB-C mobile controllers through universal compatibility between Android and Apple devices.
IPhone 15 to Support USB-C ; Backbone One Also Supported
Backbone One Review
iPhone 15 C : r/Backbone
Gen 1 USB-C vs. gen 2 for iPhone 15 Pro Max : r/Backbone
Best Game Controllers For iPhone 15 And iPhone 15 Pro - iOS Hacker
Backbone USB-C controllers will work with the iPhone 15 Pro
Backbone's USB-C controller plays nicely with the new iPhone 15 - Polygon
USB-C iPhones are here, but will Backbone One work with them?
Backbone One Mobile Gaming Controller for iPhone, Black