sending txt or making calls via the wireless

[metalurch]

hey guys I am new here.
I work off shore and am gone for 28 days at a time.
I bought the htc touch pro for its wireless .I was told that I could call home via the internet.
we have wireless internet on my platform,I was told by a G1 user that he made calls with the internet connection.
Is this possible with the touch pro if so how do I go about it.
thanks for the help
C