Hi lauren first of all the phone your buying is it brand new ? if it is & you get it unlocked then it invalidates the warantee of the phone i.e if anything goes wrong with the phone then you will have to pay for any repairs because the phones been tampered with ! but if you do get it unlocked take it to a market stall or a shop that unlocks phones it should cost around £10/£15 to do ! there may be some sites on the web that you could unlock it for free but i wouldnt trust those sort of sites myself ! just an extra bit of info for you if & when you get it unlocked what you need to do is go to your network provider & get the settings for mms & the internet so that you can access the internet & still send & recieve picture messages
1 - Switch ON your Sony Ericsson W350i without any SIM Card,
2 - Press the left arrow key/button once,
3 - Press the button * twice,
4 - Press the left arrow key/button once,
5 - The message "Personalize with MNC2" will appear, (or you will have displayed an unlock menu, select the lock you want to unlock)
6 - Enter the Unlock Code.