So lets take it one step further. I have a 4G card in my Bionic (unlimited) and a 4G card in my Xoom (2Gig limit). My understanding is that the 4G is tied to the sim card but the 3G that is build in the phone will still register as data from that particular phone.. Or device. So if I were to swap my 4G cards so that my unlimited was in my Xoom and my 2 gig limit was in my bionic, could I monitor my data on the card the has the 2 gig limit and when I approach that limit, go into my phone settings and swtich to 3G so that the data is no longer being tied to that sim card? Then, for the rest of the month, I could just be on 3G on my phone with unlimited data, while my xoom was still on 4G with unlimited data.
It sounds like it would work, but what do you think?