QUOTE(alex333 @ May 12 2007, 03:30 PM) 
You could always try using JAJAH mobile (google it)......their service lets you use your psp as a phone, but you need an active wifi connection, so its not perfect.
Hi,
I tried Jajah, AimonPsp, Heysan and Ebuddy but I like Heysan the best -check it out!
http://www.heysan.com/psp/