Use phone call conversion tracking to help you see how effectively your ads lead to phone calls from your website.
https://support.google.com/google-ads/answer/6095883?co=ADWORDS.IsAWNCustomer%3Dfalse&hl=en-AU
Analytics and Tracking · Call Tracking
Get access to data on 52,347 websites that are Google Call Conversion Tracking Customers. We know of 15,084 live websites using Google Call Conversion Tracking and an additional 37,263 sites that used Google Call Conversion Tracking historically and 8,310 websites in the United States.
Get a list of 52,347 websites using Google Call Conversion Tracking which includes location information, hosting data, contact details, 15,084 currently live websites and an additional 32,133 domains that redirect to sites in this list. 37,263 sites that used this technology previously and 8,310 websites in the United States currently using Google Call Conversion Tracking.