This tool can help your clients find international dialing instructions.
Country Codes Tool Provided By Code My Country
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<div style="width:300px; background-color:#fff;border:2px solid #888;align:center;text-align:center"> <script type="text/javascript" src="https://codemycountry.com/dialcode_from.php"></script><font class="Vmsg_1"> Country Codes Tool Provided By <a href="https://codemycountry.com">Code My Country</a></font></div>