The Nexus One can also make GrooveIp calls over 3G, and I have it also set up using sipgate to receive sip calls, but also receive "real world" phone number calls using a free phone number from ipkall.
It all works so well, that I've considered just buying a Xoom LTE tablet, and using that as my primary phone. The only reason I've decided against this, is that sometimes, I really want a phone I can stuff into a pocket.
What is intriguing about this article is the mention of a $40 unlimited data plan from T-Mobile.
Is that for real? Does that still exist?
I assume it's not LTE, but HSPA+.... but still, that has me thinking....