The feature that differentiates this from other Blackberries is UMA - unlicensed mobile access. In contrast to the AT&T Blackberry 8820, this T-mobile 8320 allows one to SPEAK over wifi. The 8820 can only use wifi for data.
It roams seamlessly between wifi networks and EDGE/GSM networks without dropping the call. I started a call from a Starbucks wifi network and walked out of its range. The phone switched over to the GSM network without dropping the call - no problem. I then walked into my office where there is wifi, and the phone switched over to wifi.
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