What's the best way to add a call to action on a banner?

The strongest banners give people exactly one thing to do. Listing a phone number, a website, and a QR code all at once splits attention and gets none of them acted on.

• Pick one action: a phone number, a short URL, or a QR code, not all three.
• Make it large: the call to action should be one of the biggest elements on the banner.
• Place it in the lower third: that is where the eye naturally settles after reading the headline.
• Use a QR code for mobile: a scannable code can link straight to a landing page or offer, which shortens the path to action.

Keep the surrounding space clean so the call to action stands out instead of competing with other text.