You can get the Network unlock code for your for your Samsung D600E phone http://www.superunlockcodes.com/samsung-d600e/rs16wp9/
sahana
August 2013
take a look at Martin Lewis Money Saving Tips.
This weeks was about that very subject.
Good luck
Peter Clews
April 2008
Have you tried searching google for the unlock code. Thats what I usually do. Alternatively, most networks will give you the unlock code if you top up a certain amount (i.e. Tesco will unlock it for free if you top up £30.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix mobile phones.