How to trigger a phone call when clicking a link in a web page on mobile phone
Most modern devices support the tel: scheme. So use <a href=”tel:555-555-5555″>555-555-5555</a> and you should be good to go. If you want to use it for an image, the <a> tag can handle the <img/> placed in it just like other normal situations with : <a href=”tel:555-555-5555″><img src=”path/to/phone/icon.jpg” alt=”Call 555-555-5555″ /></a>