Originally Posted by Dogcow
So my understanding of CDMA technology is that it can not handle voice and data at the same time. This goes against a lot of the multitasking functionality of the iphones. Additionally. Doesn't facetime use 3G voice + data (wifi for now, 3g later) to make a video call? This doesn't seem technically possible on CDMA.
To be more clear, CDMA (2G) is used for voice. Compared to GSM (2G) the voice algorithm is pretty universally better than GSM. It also has come other advantages, too. CDMA2000/EV-DO Rev. A(3G) is for data and wasn't designed to do simultaneous voice and data. EV-DO Rev. B is.
Even when connected to CDMA2000 calls are still made and received via CDMA, this is apparently more efficient than GSM-based users being on UMTS (3G) and making and receiving calls on 3G, which is more power insensitive. The only phones that tend to beat the iPhone in battery duration are CDMA phones and only when stating 3G calls.
Verizon has reportedly working on simultaneous V&D over Rev. A without actually upgrading to Rev B. I have no idea how they'd accomplish this but I think they need this in short order.
FaceTime appears to use protocols that put V&D all on WiFi.
Originally Posted by hittrj01
CDMA itself is capable of voice + data, at least with EVDO Rev. A.
Eveything I've ever read on the subject states simulations V&D in Rev. A is not possible.
Originally Posted by SSquirrel
As stated before, CDMA phones could well be for China, but if they are going to be producing CDMA iPhones, they may as well sell them on Verizon and Sprint in the US as well.
I have no idea how this get pushed around. Creating a CDMA phone for China makes no sense. Verizon and Sprint both have many more potential customers for a CDMA iPhone than China. China's CDMA carrier is the 3rd largest in the country and only has 65M subs. If they are going to add an alternative option to China that is focused on China first then it would China Mobile with 500M subs on TD-SCDMA. Now, if they focus on the US first then including other CDMA networks throughout the world isn't an issue, but China wouldn't their first consideration for CDMA phone.
Originally Posted by jsmythe00
I'm thinking the same thing. Why would ATT allow such a gracious upgrade policy?!? They're running scared. Companies don't offer that kind of deal unless they had alot to gain or alot to lose.
That is one theory. Another is that they lose nothing with this early upgrade because they raised the ETF fee to $325 so they do gain you for another 2 years and risk losing little. I'm quite torn as I think both might be in play, and even if their contract is up I don't think they know Apple's plans.