Really trying not to be rude but for a forum multiple y people markd as answering close to 10,000 questions I'm sure not getting much help, not even someone asking for clarification if they don't understand the question. I think this forum might have been a waste of time hoping to find assistance.
Please use a text field (rather than a Number field) in your form for the 'Phone' field.
Go to FormsCentral, open your form and select the 'Phone' field in your form, on the right side, in the field Property panel, select "Text" in field type drop down.
Hope this helps
I thought there might be a selection or something but your suggestion work for letting my user add dashes in numbers fields. Thanks