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Now that Verizon Wireless is getting traction with the iPhone 4 on their CDMA network AT&T is left trying to find ways of differentiating itself. While it’s too early to know how much of a bloodletting AT&T will suffer, it’s clear that in many parts of the country Verizon’s much touted network supremacy will win over a significant number of frustrated AT&T customers, even if it means buying a new CDMA capable iPhone4.

Perhaps the biggest difference between the two carriers is the type of networks they operate. Networks based upon GSM standards, like AT&T and T-Mobile here in the US, allow the simultaneous use of voice and data. In marked contrast, CDMA networks like Verizon’s, simply don’t do this.