Contact form 7 telephone number verification
<p>I am trying to use the built in verification method for contact form 7 to verify a telephone number.</p>

<p><strong>Contact form 7 markup:</strong></p>

<pre><code>&lt;p&gt;[number* your-telephone min:1000000000 max:9999999999 placeholder "Telephone number"] &lt;/p&gt;

&lt;p&gt;[submit "submit"]&lt;/p&gt;
</code></pre>

<p>So, what I am trying to do here is restrict phone number using the min and max properties of input type of number. But the problem here is that if I enter a telephone number say: 0402356584 then it is less than the min value but is still a phone number.</p>

<p>So, how can I set the min and max value to support all possible 10 digit telephone numbers? </p>

<p>Any other solution different from my approach is also most welcome. Because I have got a feeling that the verification can not be done using min and max attributes.</p>

<p>I also tried to edit the plugin files via functions.php file by using the code from a <a href="https://wordpress.org/support/topic/number-phone-validation-for-contact-form-7-doing-it-manually" rel="noreferrer">source</a> but that did not work.</p>

<p>So, if any one has the perfect solution to validate telephone numbers on contact form 7 then please post your answers.</p>