A good cam site on mobile should load fast, scroll cleanly, and not require workarounds. The sites in this list have been tested on mobile directly — not just "mobile-friendly" in theory.
What actually breaks on mobile
The most common mobile problems on cam sites are slow video buffering on a cellular connection, room grids that don't reflow properly on a small screen, and chat inputs that get covered by the on-screen keyboard. None of those show up on a desktop review, which is why a site can score well generally and still be frustrating to actually use on a phone.
What separates a good mobile site from a bad one here
Jerkmate's mobile layout is clean and the quiz-based matching means less scrolling, since you're taken more directly to a recommended room rather than paging through a full grid. Chaturbate's mobile site handles a large catalog well despite the scale, with search and filters that stay usable rather than collapsing into a desktop-only menu. Stripchat's interface is one of the quickest to navigate on a small screen, with minimal load time between rooms.
If your phone is your main device
If your phone is your main device, start with these — the difference between a platform that was designed mobile-first and one that just resizes its desktop layout is usually obvious within the first couple of taps.