I currently have a Droid that works on verizon's version of 3g. with all this talk about up coming metered pricing for wireless access, I was wondering whether when it comes time to upgrade my phone to a 4G device, whether it will also work on 3G networks. I ask because current speeds work well for my use and I'm tempted to keep my current unlimited plan if a metered plan becomes more expensive. however I won't be able to do that is my replacement 4G phone won't work in 3G networks. Any thoughts?