That doesn't make any sense when compared with what the notice says. The bill says starting the 15th, the price is going up. This is halfway through the current month contract period. The notice wasn't on the bill on my October 4th billing, it was on the November 4th bill, which I didn't get until several days after.
I actually only found out because of the notice they placed on the web site when I logged in to pay my bill. I then opened the paper bill and saw the notice there as well. So then I went back to my previous bill and there was no notice. So according to VZW, a one week notice is sufficient to start billing me more.