I've been googling around but all the unlocking solutions I've found have charged.
Is there any way to unlock a Sony Ericsson W890i free of charge?
Oh, it's on Orange, by the way.
No there is NOT you need to pay like everybody else if you don't have the software...
try giffgaff unlockopedia its free for most phones
Have a look here http://www.cellunlocker.net/blog/2010/06/how-to-unlock-sony-ericsson-w890i/
do a google search for aerix