Unlimited Calling Using Wi-fi

Hi... can anyone provide any info on how to take advantage of unlimited cell phone calls without burning your minutes using wi-fi connection. Is there any subscriptions required. I'm with T-mobile but using an UNlocked Nokia E51 (wi-fi capable). Appreciate any replies!!! Thanks in advance.

hearing aobut this for the first time... first of all..is this possible!???

If you subscribe to a VoIP company such as skype, it is possible to configure your phone to use the skype servers and wifi rather than your wireless minutes.

cool

Hi... can anyone provide any info on how to take advantage of unlimited cell phone calls without burning your minutes using wi-fi connection. Is there any subscriptions required. I'm with telus in canada, using, samsung sph-m620 would like to connect to my wireless home network? any hints appreciated