Originally Posted by MarcoFSilva
Sorry, maybe I wasn't clear enough. I meant if there is a way to unlock the network on the phone ( meaning, that I can use any sim card from any operator on the market )
My apologies, I put simple card, instead of sim card. I am from the UK, and if the phone is purchased from a store here called Carphone Warehouse, it will be sim free, which means it is unlocked to any network when it is bought. It will not need to be unlocked, as it will have never been locked to a network in the first place. You should be able to simply put in your Portuguese sim card, and use the phone as soon as it arrives. If your friend buys it from a network store; for example they buy it at a 3 store, a Vodafone store, etc, it will be locked to the network on which it is purchased, and will need to be unlocked, for a fee. I have the same phone, which I purchased online, and it is sim-free. If I had purchased it from Carphone Warehouse, it would also have been sim free.
Sim free means it was never locked to a network from the date of manufacture.
Unlocked means it was network locked originally, and could only be used on the network it was locked to at that time. At some point it was unlocked, whether for free or for a charge, and now works on all networks.
Network locked means it was network locked originally, and is still network locked now. This means that it will only work on the network it is locked to, unless it is unlocked at a later date.
Almost all phones sold in Carphone Warehouse are sold as unlocked, except for those which are advertised as being on 3 network. These are network locked to 3, and can only be unlocked by 3, for a fee of around £15. (UK pounds, not Euros).
There are companies online that sell unlocked handsets, but if your friend is buying in store, they would be best going to Carphone Warehouse, as there will be no need for them, or you, to get the phone unlocked.
I hope this helps to clarify things for you.