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I'm not quite sure if I understand your concern correctly. Could you please provide us more information about this? Would you like to get the phone number field and pass it on another field? If that's the case, using conditional logic should be able to do this. Here's a guide to learn more about it: http://www.jotform.com/help/57-Smart-Forms-Using-Conditional-Logic. You can copy a field's value and pass it on another field automatically.
We'll wait for your response.