simpsor wrote:
SIM locked: yes(how to understand that? "approved in all EU countries"(written on the box) If I'm not mistaken it means that it sim-free, )
I do not think that means unlocked at all. Many 3rd party sellers in Europe seem to offer SIM-free phones, but they lock to the carrier that you activate them with. In other words, they are indeed SIM-free in that they are sold without a particular carrier's SIM, but the minute you put a specific carrier's SIM in them and activate service, they lock to that carrier.
SIM-free has never meant permanently carrier unlocked, to my knowledge.
eg. the Carphone Warehouse web store in the UK sells SIM-free iPhones, but their fine print states:
"iPhone will lock itself to the network of the first SIM card that is used in the phone. Subsequently attempting to use it on any other network, for example by replacing the SIM card, may mean it becomes permanently unusable. SIM free iPhones can only be used with a UK-network SIM card, and will not accept foreign SIM cards."
It sounds like this is the sort of deal you purchased.