It's not. Only Apple are selling them SIM-free at the moment. I wasn't aware that the networks were even selling them as PAYG yet.Walking backwards maybe.
As for the unlocked thing I know a couple of people that purchased them simfree so maybe it's a rule that can be bent :s
Sorry to keep on but i'd really like to see you walk from Chafford Hundred Station to Best Buy is less then 10 minutes.Walking backwards maybe.