And so, they write that the PCT is blocked by wi-fi and blackberry messenger
Not only write, actually block. And plus to this, the phone is locked to the operator. You can unlock Wi-Fi on the latest OS6 and OS7 firmware. Unlock BBM does not work. Untie the operator may also not work. If my opinion is interesting, it is better not to buy PCT devices (at least for now). I prefer to buy on eBay, unlocked + Russian keyboard. There is only one drawback - you have to wait until brought. The rest of the pros - it will be a normal BlackBerry, and not neutered, at an adequate price.