I have a T-Mobile Vivacity running the CyanogenMod 7 ROM. I unlocked it ages ago, and have been using it successfully in the UK with a Three SIM.
Sometimes on starting up, the phone would still ask me for the SIM unlock code - but there was a "dismiss" button, and if I pressed it, everything worked. I believe some other posters here have mentioned this kind of phone behaviour too. (See http://www.modaco.co...20#entry1935771)
However, I'm currently in Greece, and I just bought a Wind F2G pay as you go SIM card. After entering the SIM PIN (and dismissing the unlock request as usual), the SIM error icon reappears in the status bar, and on the lock screen it says "No SIM card". I can try searching for a network, but after choosing "Wind", an error message says that registration was unsuccessful. The staff in the Wind store tried putting the new SIM into their phone, and it worked, so they believe the problem lies in my phone still somehow being locked, rather than the SIM itself being faulty.
Any ideas? Is there any chance a different ROM would solve this problem, if no easier solution can be found?
Edited by JCPren, 19 August 2013 - 10:18 AM.