After I ended my contract and pay for the mobile I asked them to unlock it from the network. They send 2 times wrong codes and they locked it for good. They said that they have to swap the phone. I travelled from Greece back in order to receive my new phone.They send a used one with Dpd courier but I never received it. I was expecting the courier for 4 days but the never came up. I was contacting o2 customer service 5 times per day. I had to explain the story in every agent and everyone was telling me something different. At last they send me to 02 store in order to leave my phone there and give me back the whole amount of money I paid for that. Of course, in the stote they knew nothing. We called tbem from there again. They said that the offer 280 only and that they are sorry they can't do anything. I feel sorry for been in their network. Never again o2. The worst customer service ever. Do not go there...