A Qualcomm baseband supports not only HSPA (now used by the iPhone 4), but also HSPA +, LTE and EV-DO.

Qualcomm基带芯片不仅支持HSPA(也就是现在iPhone 4所使用的)，而且还有HSPA +，LTE和EV - DO。

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And the latest enhancements of 3G technology, such as HSDPA and EV-DO, are improving fast.

高速下行分组接入（HSDPA）和演变数据优化（EV-DO）等3G的最新加强技术进步迅速。

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When you can't get a 4g connection, the fallback is to use Sprint's 3g network, which is based on EV-DO (Evolution Data Optimized) technology.

当你连接不上4 G网络的时候，你所能依赖的就是Sprint的基于EV - DO(演变数据优化)3g网络了。

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For Nextel, the benefit of EV-DO is that handsets already exist, and it is possible to implement push-to-talk functionality, on a par with Nextel's existing service, on an EV-DO network.

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And while the EV-DO connection was fast enough for web browsing, the review cautioned against trying to use it for real-time applications like VoIP (of course, the same could be said for standalone EV-DO as well).

ENGADGET: Kyocera KR1 EV-DO router reviewed

You might think that the EV-DO technology path has seen better days, what with carriers like Bell and Telus defecting for HSPA and others prepping to pull the plug altogether -- but really, it might take nothing more than one massive, eight-figure subscriber deployment of a next-gen EV-DO network to get things up and running again.

ENGADGET: China Telecom mulling huge EV-DO Rev. B rollout? Mobile