Phone Number

[jtm7699]

I am trying to check and make sure that the User has entered a proper format Phone number

555-555-5555
or
555-5555

i tried to use the

textbox.text<>format(textbox.text,"###-####)

and

textbox.text<>format(textbox.text,"###-###-####)

but if i enter 1234-55
it says that it is valid. How can i make sure that all the pos-holders are filled

thanks