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He had you hold the power button down with no battery or SIM card in the phone? What was that supposed to do? Or did I misread your post?
As far as MyVerizon, that will eventually update. I think mine looked like that for a whole week after I got my GNex and again when I changed SIM cards.
Holding down the power button will dump something. I used to do it to PC's. I am having memory issues as to the Sim card being in or out now. Ugh!