The Current State of Telephone Links
If you’re designing for multiple screens there’s a good chance that mobiles are going to be part of your target market. There’s also a good chance that you’ll have a phone number on the site… and a really good chance that a user will want to easily click to call that number. Here’s how…
Telephone links are a thing. Like an anchor link you tap to (probably) go to another page, these are links you tap to call a number on a phone-capable device. They’ve been around for quite some time. Yet, they cause me a lot of confusion. For example, many devices will automagically recognize phone numbers and do the linking for us, but not always.
An excerpt from The Current State of Telephone Links