When Bob using EV-DO high speed connection with his notebook and mobile phone via bluetooth, he finds that bluetooth is will eventually slow down the actual connection speed.

Technology maven Bob Frankston reports: "One example of how [Bluetooth's deficiency] plays out is in the mismatch between Bluetooth and EV-DO. I had planned to use Bluetooth as a relay so I could use my phone to access the Internet as I do with 1xRTT (the earlier version of EV-DO) but Bluetooth is too slow! It's just starting to roll out and is already obsolete. The next version of Bluetooth isn't available yet but is still too slow." Frankston, always a Bluetooth skeptic, is reinforced in his doubts: "We've already seen landline connectivity transformed and telephony itself becoming just a minor software application. 802.11 allows for new applications while Bluetooth is stuck in the past. EV-DO and Bluetooth are the best of the past. To go further we'll need to shift to native IP for wireless connectivity just like we are doing for wired connectivity."

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PC Magazine already did their speed test on varius wireless connection

"We also tested EV-DO speeds using the Audiovox XV6600 PDA/phone. Hooking it to a laptop via Bluetooth cut its download speeds by half, to an average of 300 Kbps. (Bluetooth has a real-world throughput of 700 Kbps.) The bottleneck seems to be in the Bluetooth PDA-to-laptop connection, not in the PDA itself."

The EV-DO speed is reduced to almost half of what it should give.

pcmag.com