Unlock Codes for K550i and K850i

[adam-in-oz]

You need XS++3.1 and flash drivers.You find all that here USB Flash Driver Installation - Guide - Top Sony Forums and here XS++ 3.1 Guide-Flashing, Customizing, Recovering - Top Sony Forums Read this 2 tutorials,gonnect phone with XS++ and post log here without IMEI number.
After that you can unlock that phone(if is CID52) for free,or with some payed service if is CID53(because for now there is no free support tools for CID53)

I also have a k550i, locked to Orange in the UK on an 18 mth contract when I've moved to Oz... I've followed the tutorials etc and the CID is 53 :(

Can anyone recommend an online service that works and doesn't cost more than the phone did?

[adam-in-oz]

Just been pointed to the link at the top of the page - unlock IMEI ...

Went through the how to get details required - have imei no. went into service menu to find lock info and that option isn't on any of the menus. Does this mean that there are no locks?

Many thanks in anticipation