Contact Form 7 Telephone number field validation is not working.

RE: Typing any number inside the phone field will show message sent successfully message.

The CF7 [tel] tag implements the new HTML5 tel input type which has no real validation – see https://www.wufoo.com/html5/types/2-tel.html

Come on don’t tell me that it is impossible to implement the phone number validation with Contact Form 7. i know that there is some sort of solution for this because in the back-end of contact form 7 there is a list of error messages that the users will see if they do any mistake in filling up the forms and it also include an error message for telephone field like this ” the phone number you have entered is invalid “.

Please someone help me.