Why does my checkout button work on desktop but do absolutely nothing on iPhone?

This mobile-specific block happens when desktop hover styles (CSS) break mobile touch responsiveness, or when heavy cart tracking scripts timeout before execution on slower mobile web browsers.

“This is a classic case of desktop-only hover styles fighting with mobile touch, or a tracking script that’s too heavy for a phone’s connection. I’ll find the exact break point and have it working on mobile within 24 hours for $99.”
— Jeff Bollettino, Managing Director, Ignite Conversions