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JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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Hello, thank you for contacting us. You may use a Mask to follow a correct pattern to have 10 numbers just like on the image below:
Make sure that you enable "Input Mask" and configure the mask from "Mask Value". If you require further assistance, please do not hesitate to ask. Thank you
I use a mask and set a pattern for 10 numbers,but our user remains can type less than 10 numbers,and it can pass the verification.
I don't think there is a solution for that, at least not for now. Still, I will submit a request ticket to have this corrected.
We will let you know if and when it gets released.