Related to this, in not such an easy way, the key thing that i gathered from a lengthy call with At&t when trying to add the Xperia 10 ii (returned it cause At&t insisted it will not work) is that and impacts my current Xperia 10 (which they said it likely won't but were less insistent). The key thing is they are doing a full court press (basketball) whenever a new device hits a 3G tower, which was the case with the Xperia 10 ii, for some reason on data it would not go 4G, so they immediately disabled it. However when calling them and getting to the advance tech support, they will ok