New EV-DO Standard Supports Video Calling
Handsets
1xRTT, EV-DO, or any wireless standard to date, is a hardware feature and can't be upgraded. Even EDGE, which is relatively simple, needs to be implemented in hardware.
There is technology on the horizon called Software-Defined Radio (SDR), which would allow such upgrades. There are some companies experimenting with this for towers, but I haven't heard about any handsets supporting it yet - not even prototypes in the lab. It might be something that requires more processing power than can currently be done in a phone.
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