Our friends at Sony have pushed 8 million PSP's across the pond in the UK. Those lucky 8 million users will soon have access to VOIP phone service on their PSP if they choose to pay for the service. They will be able to use voice and video communications. I would be a happy Groupster if they were only sure about bringing it to America, but only time will tell.
In the meantime UK telecom BT is working with PSP to bring service to the good folks in the UK, they will be able to call other PSP's, mobile phones, landlines, and SMS messaging (the typing isnt even T9! LOL)