Customize Phone Field

I want to change this field so the Phone number will be 123-456-7890

format not like the current 1234567890 when it comes in my email.

Not a lot of experience with Contact 7 so hopefully this is easily done by just tweaking the code

for this field.

<label> Phone Number (required)

    [tel* phone] </label>

Thanks in advance

The page I need help with: [log in to see the link]