I'll add my question here instead of starting a new thread even though I'm not finding specifics when I search.
I currently have a Droid X and the 3G is slow, reading about 300-400Kbps on speedtest.net app at best, and often drops into 1X probably half the time with downloads of just 70-80Kbps. This is because of my work location in the ground floor/basement of a 90+ year old 5 story building, even though I'm in an urban area with 4G and 3G coverage. I do have a window, but unless I go outside I cannot get decent speeds on 3G. Not many people work in this area and no one has a 4G phone to even test the speed unfortunately.
I can upgrade to the RAZR and continue my unlimited data per VZW, but I don't want to waste $200-$300 if 4G won't work at all or be reasonably fast given my constraints. Is there anyone in a similar situation that gets good 4G speeds with the RAZR after having terrible 3G speeds on the previous phone given building/basement interference issues?
Thanks
Your concerns are justified. Things that can contribute to your signal issues are the building's age (older buildings often have stone foundations), size (larger buildings have thicker foundation walls), depth (older buildings often have deeper sub-ground levels), type of construction (often older buildings will have thick masonry construction even in upper walls), the number and density of large buildings all around (buildings both prevent penetration and reflect signals creating multi-path signals that are difficult to lock onto), etc.
Fortunately the 4G LTE signal for Verizon runs on the 700Mhz band rather than the 800Mhz and 1,900Mhz bands of Cellular and 3G. This means the wavelengths of the 700Mhz band being longer are actually better at penetrating structures. How much better is the question and frankly the difference between 700Mhz and 800Mhz is a relatively small percentage so the overall effect may be minimal. See chart below.
There is also the issue of what types of antennas are covering your area, how densely those antennas are placed, and what if any directional antennas are placed on nearby buildings to supplement the coverage in poor reception areas. Then there's the question of whether 4G is provided in your area with Extended Coverage antennas or not. As I mentioned in another post either earlier here or elsewhere, I can't remember, but 4G LTE Coverage Areas are provided coverage with standard antennas which create a somewhat donut-shaped signal path, where the hole is the antenna and the donut is laying flat. In those areas, ground penetration will be better within the middle range of the signal's reach but worse as you get farther out. Conversely 4G LTE Extended Coverage areas which use directional beam antennas whose pattern looks more like a squashed donut or even a squashed triangular section of a donut, so the coverage reaches farther but is not as tall from top to bottom of signal reach, meaning ground penetration will be less.
It's tough to say how this will fare for you, but there is the possibility that if 4G is strong generally in your urban area, that your 4G in the building could be even better than the 3G you have now. Also, even a poor 4G signal could still beat a poor 3G signal hands-down for data speed simply by design. I suggest you visit
http://network4g.verizonwireless.com/#/coverage , and type in your physical building's address at the bottom left, click the RED "Am I covered", and then when it pops up, click the RED "View Coverage Map. There you'll get a detailed view of coverage for your immediate areas. Pay close attention to the color of the 4G coverage represented on the map. You are hoping for the DARK RED area as a best case scenario, but if in the RED area, you would hope to be close to the edges of the DARK RED. Try zooming in and out to get a clearer view of coverage at street level and regionally.