I have changed the OS on 8310 and an 8110 from SUNCOM to TMobile using ... BlackBerry Curve forum
SIM invalid after OS change
I have changed the OS on 8310 and an 8110 from SUNCOM to TMobile using JL Commander and installing OS with vendor removed. OS loads fine, but neither will recognize TMobile SIMS card. I received an unlock code from TMobile for the 8310 SIMS card, but it will not recognize it in the phone to unlock it. I am doing all this with the radio off as it requires. Any ideas????
The phone needs to be unlocked... not the SIM card. The tmo SIM card should work in any unlocked GSM device. Try to get the device unlocked first.
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