Support Please help! No signal after unlocking?!?

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http://androidforums.com – Hello I have a samsung galaxy ace gt-s5830 which was originally on o2 uk that i wanted to use on vodafone uk I managed to root the phone and get the unlock code from the phone via the bml5.img and the XVI32 Hex Editor I then unrooted the phone put in the new sim and entered the unlock code The phone now says vodafone uk on the lock screen but doesnt have any signal!?! It still has an imei and baseband number and ive checked that the imei number isnt blocked Ive also checked that all locks are off via samsung code *#7465625# I have flashed the firmware to UK Gingerbread 2.3.6. using odin 4. (General)