Sticky CTA
A mobile-only sticky CTA at the bottom of the screen. 10-25% conversion lift on most sites. Don't make it intrusive — half-width, thin bar.
Tap-to-call
If phone is a conversion channel, tel: links on every phone number on mobile. Zero friction to call.
Simplified forms
Mobile forms should have 1 field per screen, or 3 max per section. Desktop forms often don't translate — rebuild for mobile.