If you are on Business Plan or higher you can enable Custom Caller ID that will help your website visitors see your Business phone number on their phones when they are requesting a callback from your website. That will help them to get in touch with you later and save your phone number in their address book.
To set up a Caller ID, you would need to complete 2 steps:
Step 1. Verify your phone number
Products & Settings / Callback Widget / Websites / Caller ID
Step 2. Adjust your Caller ID behavior for Agents and Customers.