Sometimes a website may look fine on a single phone, but that does not mean it is mobile friendly. A truly mobile friendly site should load fast, adjust to different screen sizes, and make it easy to click buttons without zooming. It should also have text that is large enough to read and menus that are easy to find. You can test this by opening your site on different phones or tablets. There are also free online tools that check how well your site works on mobile. A site that only looks good but is hard to use can still drive visitors away. What do you think makes people stay longer on a mobile website?