Why is my iPhone 2G, 3.1.3 jailbreak not accepting my T-Mobile SIM?

Chip R

New member
I used redsn0w to jailbreak and unlock my iPhone 2G running on 3.1.3, but when I pop in the T-Mobile SIM card it does not accept it. It tells me to connect to iTunes, and when I do that it says the SIM card is not compatible. Do I have to download an app through Cydia or something?
 
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