I'm afraid you can't since your UK 3G iPhone is at Fw 2.2.1 v baseband 2.30.03 and boot loader version is 6.02. Only bootloader 5.08 will be able to.

You need to purchase GeveySim or TurboSim to unlock for calls etc. Head to Garagesale as some forumers are selling those hardware unlock.

no you cant, Gevey/turbo sim will needed.

  just hoping that 2 or 3 months later dev team will have the solution to unlock it with new baseband

---

Added on May 1, 2009, 1:25 pm@ added:

If you are willing to wait then i guess it should be ok, it will be able to unlock it in the future, just need to wait until new unlock method by dev team and there will be no such date when the unlock method will be release.  the price of gevey/turbo sim around 120 to 150 RM.

i believe dev team will not do solution to unlock the 2.30 baseband, maybe there will use baseband starting from 4.22 since it for iphone OS 3.0 and OS 3.0 cannot use baseband 2.28 or 2.30 because its different from new baseband 4.22( PLEASE CORRECT ME IF IM WRONG, HUHU )..
so i guess dev team will only do the unlocked method for 4.22 baseband ( please correct me if im wrong huhu...);;

Taka.