html input for phone with the country code selection w3 school code example
Example: number dropdown html
<select id="selectNumber">
<option value="1">One</option>
<option value="2">Two</option>
<option value="3">Three</option>
</select>
<select id="selectNumber">
<option value="1">One</option>
<option value="2">Two</option>
<option value="3">Three</option>
</select>