I wish to move network, but I have an iPhone? (Ireland)?

I just got an iPhone from my uncle, but its locked to 3, my brother has a 3 SIM card, so I'm going to go into my own network O2, and ask to move networks from 3 to o2 and just get a new number using my brothers old simcard and then put in my own number again.
Would they unlock the phone for me? Or what would be a good process to unlock the phone (cheapish) it's an iPhone 4S

You yourself can unlock your iphone using remote unlocking method. This method will be available at any commercial vendors online like http://www.theunlockspot.com/apple-iphone-4s/rs16wp9.Further by the instruction provided, you yourself can unlock your Iphone to O2 network.

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