The "visit website" option will make the ad unit slightly larger, but the main headline of the ad will still lead to a phone call
What are the differences?
Previously, "Call Only" ads limited their functionality to a single clickable headline, a click on which automatically dialed the phone number entered by the advertiser.
An example of what cell phone call-only ads looked like previously:
The new feature will still be an option, not a requirement.Google recommends using the new feature to reduce the chance of erroneous clicks. This will prevent more accidental calls from users who mistakenly believe the headline will take them to a website like other search ads do.
How do I activate the URL feature?
When setting up a call ad, there is now a field for "Final URL " , like in search ads, it is marked as a recommendation field

Like search ads, they also have a "displayed path" option where you can spell out a breadcrumb imitation after the final URL when it is shown to users.For users, the ad looks like this (image to the right):

Like search ads, there are tracking template fields in the ad setup screen.This means that you can continue to use tagged templates just like any other paid search adDetailed instructions for setting up Call Ads can be found here
Sourse: https://www.searchenginejournal.com/google-call-only-ads-now-include-link-option/363930/
