What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
I'm sorry, but can you elaborate further the thing you want in the form? Are you trying to validate the mobile phone number in the form to make sure that only valid numbers are submitted by your customers? If so, you can use our SMS validation widget: http://widgets.jotform.com/widget/sms_confirmation. This widget requires a Twilio account. Kindly check and please let us know if this doesn't answer your question.