I posted a COM phone dialer a while back as an answer to another post. It used the MSComm component and I have since learned that many people will not have the MSComm ocx file on thier system (unless they once had VB6 installed). It is a royalty component and therefore cannot be redistributed.
Fortunately, there is a freeware version created to be a full emulation of that control that you can download and install from HardAndSoftware. You'll find the download link here: NetComm Update: New