I don't believe this is true. I have the 8320 and I have the $19.99 data plan and voice. As a test I just turned off the radio connection which supplies EDGE and GSM, and only left on my Wi-Fi connection. I was able to browse the web and make a phone call completely over Wi-Fi. Now maybe the device I can still tell I have the proper data and voiceplans, but since the actual radio was off I don't think it could.
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I don't believe this is true. I have the 8320 and I have the $19.99 data plan and voice. As a test I just turned off the radio connection which supplies EDGE and GSM, and only left on my Wi-Fi connection. I was able to browse the web and make a phone call completely over Wi-Fi. Now maybe the device I can still tell I have the proper data and voiceplans, but since the actual radio was off I don't think it could.