Okay, so we all know that the CDMA version of the iPhone 4 has only received the minor 4.2.6 update after shipping with 4.2.5. Since then the GSM model has received the 4.3 update and the 4.3.1 update, while the CDMA version remains where it was nearly 6 weeks ago. So, I've read some people claiming that the reason for the delay or lack of update for the CDMA iPhone is because Apple is waiting on a firmware update from Qualcomm for the MDM6600 chip. Okay, I could understand that. Then the past few days I've read reviews about the HTC Thunderbolt for Verizon, which is the first Verizon phone that does simultaneous voice and data over not only LTE, but over EVDO as well. This got me to thinking. Could it be that this update Apple is waiting on from Qualcomm could be a firmware update that allows the iPhone 4 to handle simultaneous voice and data? I've done some research and no one really seems to know for sure whether or not the MDM6600 could be upgraded though firmware to be able to do this. I think if this is what's going on, it's a pretty decent reason for Apple to be holding off on updating the CDMA iPhone 4. What do you guys think, am I crazy or is this a valid theory?