iFixit's teardown of the Verizon iPhone 4 revealed that Apple used Qualcomm MDM6600 chip that supports both CDMA and GSM.
Here is iFixit's findings:
* The Qualcomm MDM6600 chip supports HSPA+ data rates of up to 14.4 Mbps and CDMA2000® 1xEV-DO Rev. A/Rev. B
* You can view the datasheet for more information on the chip.
* This is the same chipset as the Droid Pro world phone. It supports both GSM and CDMA—which means that Apple could have supported GSM!
* Why didn't they? It may be that it was easier to design antennas for a CDMA-only phone -- this phone supports two cellular frequency bands, while Apple supports five bands in the GSM version.
* Of course, there's no way it could be a real "world phone" without a SIM card slot.
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