How and is it possible to launch applications on the phone using a picture on the site?

Question

css

Hello. Is it possible to launch the viber / whatsapp application on a smartphone with the entered phone number using a picture or text (a visitor clicks) on the site, and is it really possible at all?
Thank you.

Answer 1

For Viber:
For Whatsapp:
<a href="whatsapp://send?phone=79xxxxxxxxx">

Answer 2

And the picture is like this:
Viber

<a href="viber://add?number=%2Bххххххххххх" TITLE="Позвонить через Viber +х ххх ххх хх хх ">
<img src="http://trosBMP.com/img/viber.gif">
</a>

Whatsapp

<a href="whatsapp://send?phone=%2Bxxxxxxxxxxxx" TITLE="Позвонить через WhatsApp +xxx xx xxx xx xx">
<img src="http://trosBMP.com/img/whatsapp.gif"></a>