Font Awesome Not working:

Link: https://www.emode.lk/
Location: Footer
http://prntscr.com/m7n6aj

In the footer html i’m using below code:
Address
94-2/1, Galle Road, Colombo 06,
Sri Lanka.

Contact
(Email address hidden if logged out)
<i class=”fas fa-mobile-alt”>+94 762 98 78 78</i>
<i class=”fas fa-mobile-alt”>+94 762 83 78 78</i>
<i class=”fas fa-phone-square”>+94 114 33 91 00</i>
<i class=”fas fa-fax”>+94 114 67 49 49</i>

Here <i class=”fas fa-mobile-alt”> this kind of code not working.
I want to add mobile, phone and fax icons for the numbers in the footer.