unlocking old nokia, which use DCT3 sofwtare is easy, get a noamrla data cable (mbus), and a program called Eeprom tools by bphreaks, at ht**p://www.cubwolf.co.uk and use that to unlock them.
ever eince the above program became available Nokia have been using DCT4 sofwtare on all their new phones, thats any phone model released after the 8310 (including the 8310).
it is possible to unlock DCT4 phones using a mbus cable. But you have to get either bphreaks new software OR dejans new DCT4 software and make a log.
one you have made a log, you send it to someone, like dejan or the guys at bphreaks, and they will send you back a file to use with the program again to unlock the phone.
logs are sold in 100s, and are around $15 each.
once the respective poeple make enough money, they will release the sofwtare fully so we can do it at home.
a flashing unit for DCT4 phones is in the pipelines. I have seen one that allows changeing of PPMs (language packs). But nothing else as of yet.
thats the state of play with DCT4
we just have to wait.
if you guys want to know anything else related to this give us a shout.