I have been testing the integrated 3G capability of both the Viliv S5 3G and the X70EX 3G UMPCs and can report they both work as expected. I was able to pull the AT&T SIM out of the iPhone 3G and pop it into each UMPC in turn. The configuration was simple using the Mobile Partner utility that ships preinstalled on both units.
Using the 3G is as simple as pushing the Connect button in Mobile Partner after making sure it recognized the presence of the SIM card. You can see the SIM card information in the lower left of the Mobile Partner window:

Note that even though it’s showing as WCDMA, it’s not really — it’s HSDPA. I have run a lot of speed tests using the AT&T data network and found it to be about what I would expect speed-wise. This test was run in Mobile Tech Manor:
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I also ran a speed test in my office using the Verizon MiFi to connect to the X70 for comparison purposes. Note that my office only gets two bars of signal from Verizon:
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You can see the integrated 3G works as advertised on both the Viliv S5 and the X70EX. I prefer the simplicity of using the MiFi over Wi-Fi, but to each his own.
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