These calls will be facilitated by a soon-to-be released microphone and camera for these devices.
Initially at least, these calls will be limited to other PSP owners as well as some BT phones. BT says the first stage will include some 2,000 BT hot spots in UK fast food restaurants, train stations, hotels and airports.
The new PSP service takes advantage of BT's VoIP-compatible 21 Century Network (21CN), technology.
No date is being given for official start-up.