I don't know for sure but maybe if you have more than one card registered with Google and the one that is default doesn't have enough for the Nexus 4 or the quantity you are asking for then Google may dump the order. When I thought of this I went to Google wallet and changed the default card just for now. So I am still in wait and see mode. BTW I have not acctually signed up for Google wallet I just gave my card for a purchase and Google created a wallet but I have not activated it to any device like a phone.