HTML

html telephone link

One click should open the phone dialler and input the number to be called.
<a href="tel:5551234567">Call (555)123-4567</a>

html telephone

<a href="tel:0123456789">Click to call</a>
<!-- Adds country code with + -->
<a href="tel:+0123456789">Click to call</a> 
<!-- Adds a 1 second pause (p) then dial 123 after phone number -->
<a href="tel:0123456789p123">Click to call</a> 

html telephone link

<a href="tel:1234657890">Call (123)456-7890</a>

href phone

<a href="tel:+5511981724236">98172-4236</a>

html telephone

<a href="tel:0612345678">Call me!</a>

html href phone call

<a href="tel:8895959595">call this number 889-5959595</a>

html phone link

<!-- Brazilian pattern -->
<a href="tel:6533125487">(65) 3312-5487</a>

html telephone link

<!--We can use the HTML tel: and then the browser  
will send a call to the provided number after tel: (Structure below)-->
<a href="tel:<Your-Phone-Number>">Call Me</a>

html telephone link

<a href="tel:<phone>">Text Goes Here</a>

html telephone link

<a href="tel:5551234567">Call (555)123-4567</a>