Checking a business website on a phone
A responsive layout is only the beginning. Check whether text is readable without zooming, buttons are easy to tap, forms accept the right input, and important content appears before decorative media.
Test a slower connection and a smaller screen. Large images and third-party scripts often show their cost there first.
If a visitor cannot find a service or send a message from a phone, that is a usability problem worth fixing regardless of any search score.
