Short answer: If mobile traffic is high but mobile conversion lags desktop, your checkout path probably breaks trust — not your product.
Sign 1 — You cannot read product details in cart without zooming
If variant names, sizes, or prices truncate in the cart drawer, shoppers hesitate. They are buying blind.
Fix: Larger type in cart, clear variant labels, product thumbnail large enough to recognize.
Sign 2 — Shipping cost feels like a surprise
Nothing kills mobile checkout faster than a final-step shipping jump you did not warn about on the product page.
Fix: Shipping hint near Add to cart, free-shipping threshold in header, delivery estimate on product page.
Sign 3 — No returns or policy link before pay
New brands must prove legitimacy. If policies only live in a footer link on desktop, mobile buyers never see them.
Fix: Returns snippet under Add to cart and a trust row near checkout button.
Sign 4 — Product photos look different on phone vs desktop
Blurry crops, wrong aspect ratio, or slideshows that skip on mobile make the product feel cheap.
Fix: One strong hero image per SKU on mobile, consistent aspect ratio across catalog.
Sign 5 — Checkout loads slowly on cellular
You tested on Wi‑Fi. Your customer is on a train with two bars.
Fix: Compress images, limit apps that inject scripts on cart, test Lighthouse mobile on /cart.
What we fix in Store Upgrade Week
Store Upgrade Week ($497) rebuilds hero, product sections, and mobile trust on your live Shopify or Woo store in one week — same products, stronger front.
Next step
Send your store URL on a free 15-minute call. We list the top three mobile fixes before you commit.