How to Markup Phone Number to Click to Call Phone - Help Links

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

After making various finding we come to conculsion 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 detact phone browser etc following articles will be useful

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