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<!-- Using this JQuery library: https://github.com/jackocnr/intl-tel-input. -->
<!-- You can install it by adding:-->
<script src="--PATH--/--TO--/intlTelInput.js"></script>
<link rel="stylesheet" href="--PATH--/--TO--/intlTelInput.css">
<!-- To your head section.-->
<!-- Create Input -->
<input type="tel" id="phoneInput">
<!-- To initialise library: (In JQuery) -->
<!-- var input = document.querySelector("#phone");-->
<!-- window.intlTelInput(input, {-->
<!-- // any initialisation options go here-->
<!-- });-->