When mobile web shows unusually high cart abandonment, the first thing I'd check is the checkout flow on mobile compared to desktop. I'd look for friction unique to mobile: slow load times, cramped forms, payment errors, or hidden fees that only appear on smaller screens. Session recordings and funnel analytics often reveal where users hesitate or drop off right before payment. I'd also compare mobile browser behavior and device-specific bugs that break buttons or autofill. Heatmaps and scroll depth help confirm whether users even reach the checkout CTA.