Lately I have seen a few threads in regards to signal strength, either through the how many bars or using the field test in the Iphone in regards to throughput, drop calls or really the QoS you as a subscriber are receiving or in many cases not receiving. First off one needs to understand that WCDMA (3G) is not the same thing as GSM (2G) and the bars or even the signal strength can not be compared in the same way, you are not comparing apples to apples. The RSCP values or the signal strength in WCDMA is not the most important value when dealing to the quality of the call from a radio point of view, it's actually the signal quality (or the parameter Ec/No) that needs also to be taken into account. Not that the average subscriber cares about raw numbers, they do care that they can set up a voice call or data session, that their connection does not drop or they get the throughput promised. You can easily carry a voice call or have decent throughput in even low signal strength (-100dBm to -105dBm for example). I have seen a few threads where users say that signal strength of -95dBm is considered bad, -95dBm is fine and does not increase the chance of a drop call. But if the noise level in the system increases then that will increase the chance for low throughput or dropped calls. I have seen voice calls carried at -110 dBm in good quality single cells environment (ok it was poor voice quality but still no drop.) To show what I mean you can see from the screen shot I have an RSCP of -105dBm but in the second screen shot I have a DL speed of 3.2 Mbit/s (sorry its in Swedish but I think you get the point). Actually the field test in the iPhone is a bit lame so I did have a RF scanner and it was more of an average -102dBm. I did three test during th time, the lowest being around 1.5 Mbit/s while the image is from the best. There are so many factors in getting good service and while the signal strength is important (without coverage there can be no service) there are other important parameters such as radio quality (or a clean network) that need to be taken into account. The air interface is just a small piece of the network and many times is not the bottle neck which has been pointed out a few times. Maybe I will add the truth about 3G throughput (what does 3.6, 7.2 14.4 or 21 Mbit/s or really mean to the end user?), maybe even the truth about MMS or LTE (4G).