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I can see the phone number shows up on the recent notifications: http://www.jotform.com/help/269-How-to-view-Submissions
The previous ones doe not show, because it seems like you delete the field: http://www.jotform.com/help/294-How-to-View-Form-Revision-History
When you delete a field it's associated data get's lost. That is shown in message that appears when you attempt to delete the field.