I got nokia 6230b phone from Cingular (USA). it was unlocked and I have been using with T-Mobile (USA).However, I am in UK now and I tried with UK O2 Sim card but I got no signals at all. Other phones have full signal and I dont know if this is problem with the phone or with new sim card ? Do I have to unlock it again or is it problem with my phone ?Thank you.
Once unlocked, always unlocked. It must have something to do with the phone or the sim itself. Sometimes it could take up to 5 minutes with the new sim being in the phone to gather all updates and start working.