Any link on your Insta website can be a 'Call me' link. When a visitor tap this, a message from the Phone app will popup asking for permission to make a call.

Here's how to set up the link:

1. Add a new Card to your Insta site or edit an existing Card

2. Tap the pencil symbol to edit one of the demo links.
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3. Add some link text. In this example, that's 'Call me'. In the URL field type type 'tel:' followed by your phone number. For example: tel:0422334455
(Note there's no space between tel: and the phone number!)

4. Tap Done. Then Preview and Publish to update your Insta website.
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A visitor on your Insta website can tap this link to call you:

iOS devices also allow a visitor to tap and hold on the link for more options: