For mobile display ads, some sizes tend to perform better because they fit well on smaller screens and load quickly. The 300x250 size, also known as the medium rectangle, is one of the most common and works well in many mobile placements. The 320x50 banner, often placed at the top or bottom of a mobile screen, is also widely used. Another good option is the 320x100 large mobile banner, which gives more space to share a clear message without taking up too much of the screen. These sizes are supported by most ad networks and often get more impressions. Choosing mobile-friendly sizes helps with visibility and can lead to better engagement. Has anyone seen better results using other mobile ad sizes?