You won't ever be able to surf the web and browse the web at the same time using 1x/EVDO with the i730. 1x/EVDO takes the radio portion of the phone to be able to browse, and if you are using the radio to talk, then it's unavailable for data. CPOP is similar to what EVDO offered, which is basically call waiting for data, which gives your phone the ability to recieve calls while online, and if you take them, it puts your data on hold, and let's you talk, and then goes back to data.

The reason the WiFi/Phone hack for WM2003 worked (and no hack is needed with WM5 as it's not a broken feature and works out of the box), is there are two radios, one for data/voice, and one for WiFI. So you can be using both radios at the same time while on a call because wifi has nothing to do with your voice radio, it is it's only radio. Verizon originally disabled using WiFi and Voice at the same time in WM2003 because of the extreme battery drain, but with complaints, and the fact the WM5 won't hard reset on a dead battery, they have re-enabled that feature.

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-Michael
Need help setting up your i730/i830 or other WM2003/WM5 Phone, as well as the other hacks I have done, check out the MRailing Guides and Links