“Click to call” is a feature that allows a user, particularly on a smartphone, to initiate a phone call with a single click on a link, a number, or a dedicated button. Initially, this term referred to a service that allowed users to directly contact an advisor via computer-based telephony software or request a callback at a pre-arranged time. With the widespread adoption of smartphones, it now primarily applies to the ability to instantly call a company or advisor from a website, mobile application, or online advertisement, thus facilitating direct and rapid communication.