Most of the business puts their contact number on their website. The clickable phone number is very useful when the user browsing the website from a mobile device. Click To Call link helps to dial the phone number directly from the website with one click.
Using tel: hyperlink, you can easily make a phone number clickable. In the href attribute, add tel: and insert the phone number with the country code prefix.
The following anchor tag adds a hyperlink phone number for mobile browsing. The user can start a phone call by simply click on the link.
<a href="tel:+9199xxxxxx99">+9199xxxxxx99</a>
+91 is the country code of India and the phone number is +9199xxxxxx99.