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As of the moment there is no validation for the Phone Number field.
All it does is to check whether there was an entry or not if the field is
set to required.
Nevertheless I have added this to our feature request list.
Thanks for using JotForm.
For now, you can substitute the Phone Number field with a Text Box and turn on the number validation option. Perhaps providing a means to set up a minimum value as well as adding the number validation in Phone Number field will be the long term solution. I shall endorse these features to our Developers for further action.
Please let us know if we can be of further assistance. Thank you for using JotForm!
We have added a new feature into the Phone Question, we called it the Phone masking, the validation of phonenumber input is now depends on how the form owner put the masking.
For example. the default masking is ####-#####, the # symbols represent the numbers to be entered. Try it and let me know your comments. Please try to clean your browser cache to get the latest updates.
It's about the value of phone number.
Your solution works, but it's not for Firefox.
I tried on Chrome and Internet Explorer, and it's good. Very weird.
I send you a screenshot about that.
On my tries, I didn't replicate the same issue with you. Please, see it from the below:
It looks like your Firefox's scripting option is disabled, please use the following steps and retry to use "Phone Number" field again and please, don't forget the let us know.