I have a Galaxy S4 i9505 here and I need to get the SIM unlocked on it. See at the moment it's registered to O2 with an O2 sim card. Putting in another gives the message: 'SIM network unlock PIN' and requires a passcode. There are many guides on the internet which instruct people how to use the service menu *#0011# to change the network settings, but unfortunately I can't access the controls (the main menu doesn't appear regardless of what I do). Also there's something called "GalaxSim Unlock", an app, but I've installed this and it doesn't work either (gives the error no unlock method known for this device).
I've managed to use Odin to root the phone...or at least I think I have - but everything is exactly the same. Can anyone on here help me because it's a real pain in the arse.
I'd be happy to discuss it on Skype if you'd prefer by the way. PM me and I'll give you my ID - I would post back the solution here just so anyone reading knows.
Type: SAMSUNG Galaxy S4
OS: Android 4.4.2
Baseband version: I9505XXUFNB9
Kernal version: 3.4.0-481100