How to make phone number a Click to Call on Phone?

After making various finding we come to conclusion to have following

    Wrap all phone numbers in hyperlinks with the tel: schema.
    Always use the international dialing format.

NIST Telephone Time-of-Day Service 
<a href="tel: 1-303-499-7111"> 1 (303) 499-7111</a>

This we found on google developer page and found it working

If you want to detect phone browser etc following articles will be useful

Click here to know What is SEO?