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CMDA is a broadcasting protocal by cellular companies such as Verizon or Sprint. Other companies such as T-Mobile or AT&T use the GSM protocol. As far as I can tell, I believe your GSM iPhone 4 from AT&T is jailbreakable.Devin said:Wait. What exactly is CDMA? I have a iPhone 4, with AT&T running 4.3. Can I JB it? Or do I have to wait?