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You need to unlock the phone. Email firstname.lastname@example.org they will for a small charge of £3.99 give you the code which will unlock the phone. Any probs they refund immediately. All on line very quick service.
Basically first do a Full Reset (this is deletes Everything saved on the phone; But this is isnt the firmware so its safe) Then insert whatever SIM card you want and type in NETWORK (*#9998*638)... your phone will freeze for a sec (this is normal) and the restart... youll get a message saying "Please Wait..." and then you phone is working
NOTE: The NETWORK (*#9998*638#) code has to be typed in every time you start the phone
MY o2 j600 (J600AYGF1) was "Phone Locked, Return to service" and then i used this code and it was fine... My j600 is now back to normal by typing #0111*RANDOMCODE# and the incorrect password message came up and tyhen worked !!!!!!!!BUT PLEASE DONT DO THIS COZ IT WAS LUCKY!!!!!!!!