There is a Masked Input Plugin.
$("#phone").mask("+7(999) 999-9999"); This sets the mask for the field where one phone number is entered. How to make it so that you can enter multiple numbers?
Source: https://ru.stackoverflow.com/questions/706499/
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$("#phone").mask("+7(999) 999-9999?,+7(999) 999-9999");- br3t