Thanks for all the replies. I think for now I will stay on 1.0.2, as I'm not sure how to upgrade and its probably not worth me bricking the phone. I'm also not sure how this phone was originally unlocked. Is there anyway for me to check?
Also, its got the installer app on it, when i enter it, it says there is an update available, Should i update? Is there any guides on how to use this installer or is it pretty straight forward?