Generally speaking, it's easy to download and install the software that effectively turns your Centrino laptop into a telephone.
The steps are similar to those you follow anytime you download and install software from the Internet:
First, make sure that you trust the vendor of the software and that your antivirus software is up to date (see Chapter 17, “Protecting Your Mobile Wi-Fi Computer,” for more information about antivirus software).
Next, download the VoIP software using the download link (or button) provided by the vendor.
Run the installation program provided by the software.
Finally, follow the registration process to open an account with the VoIP provider.
I'll show how ...