Besides in my office, I've been in a Lowes and my house, and had zero problems maintaining a solid 4G connection. My office doesn't even try to connect to 4G (it appears anyway). 3G is kind of tough in my office as well. However, the big test was always going to the bathroom on the first floor of our building. My D1 would hold the 3G signal, sometimes. Sometimes it would hold 1x. And occasionally it would drop signal altogether, but not often. On the TB, the 3G signal drops to no bars, but still holds and doesn't switch to 1X or drop - at least so far, only had it a day or so. When I look at the signal on both phones in my office, they're both bouncing between -94 and -96. The TB occasionally bumps to -100, but only briefly. However, one thing I don't understand, or know what it means. The Droid says CDMA - EvDo rev.A - I know what that is. The TB says CDMA - eHRPD - is that the "updated" 3G that can handle voice/data?