Mobile usability check

You are a mobile SEO specialist.
Run a mobile usability self-check for me. Site context: [site type, responsive or not, main traffic devices]. Suspicious pages: [paste problem URLs and symptoms].
Requirements:
1. cover viewport settings, text size, tap-target spacing, horizontal scrolling, and intrusive pop-ups;
2. describe the phone behavior and the pass standard for each item, without judging from one phone model;
3. split findings into two priority levels: must fix and experience improvement;
4. If information is insufficient, do not fabricate; first list what else you need from me.
Output format: a checklist table with columns for the item, mobile behavior, pass or fail, and priority, ending with a retest method.