iPhone 4, iOS 5.0.1, redsn0w + ultrasn0w, but China Mobile SIM says no service?

[flymordecai]

Hello all, arrived in Beijing last night. My ATT iPhone 4 does not work with China Mobile SIM card even though it's jailbroken and unlocked. Under About in Settings, it says the Carrier is AT&T 11.0. I tried Hacktivation but that doesn't work for iOS 5.0.1. Any ideas?

[rockjock]

So it worked at home? meaning you were able to try other sims? very odd did you preserve your baseband?

so far no unlock for 5.0.1 jailbreak yes

[eastercat]

You didn't give us the most important info: the baseband. That's what determines unlockability.