In case you would like Facebook to track phone number clicks on your mobile landing page to count as conversions:
1. Obtain your Facebook call tracking code snippet (from within your FB account).
2. Add a click-2-call button to your landing page and double-click to enter its settings.
3. Choose the ‘Make a phone call’ option and enter the desired number.
4. Tick the checkbox ‘count clicks as conversions’. A click-2call conversion code field will appear.
5. Paste the FB call tracking code snippet in the ‘Click2Call conversion code’ field.
That’s it! Now, when a visitor clicks your "Call Now!" button, a call will be launched, while Facebook & Pagewiz will track that call event/conversion.