Hi @ayanabil ,
Thanks for your question! The easiest way to add a “Contact Seller” button with a phone number to your WooCommerce product page is by using a “tel:” link.
On your product page, just add a Button Block and set the URL to “tel:12345678” (without the quotation marks, then replace the numbers with your phone number). If you’re using page builders like Elementor, there should be an equivalent block to create buttons. When the button is clicked on a mobile device, this will open the call function with your number ready. For desktop users, they’ll need to choose an app to make the call.
Another option is using WhatsApp Button, so customers can message or call you through the app. (if this works for you).
Here’s a quick video I’ve made for you showing how to do this: https://www.loom.com/share/2ade8bfba5654934b19b26759040744c?sid=ce7771a0-f537-4728-9c97-b88f34410e02
There are also other fancy ways to add a call button using extensions or plugins. You can find them by going to Plugins → Add New in WordPress and searching for “Call Button” in the plugin repository.
Hope this helps!