Contact form 7 required filed

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Hi, I was wondering if anyone can help me make a filed on my contact from required, I am trying to make the "phone number field required, here is my form code. Thank yuo in advance


<div class="col-sm-4 noleftpadding"><p>[text text-931 placeholder "Phone Number"]</p></div>

 

[SystregSystreg is verified member.]

This might help, says you need a * in a class to make it required:

https://contactform7.com/text-fields/

Telephone number field#Telephone number field
Both tel and tel* are for single-line input and accept only telephone number. tel* is a required field.