Can you tell me the difference between 1 and 2 bars of signal compared two 3 and 4? Both still work correct? I'm pretty sure that one or two bar difference is not going to effect your use on the phone. Calls will still come in and so will text messages. I don't under the whole bars issue. My real question is how many people are dropping calls? Number wise. I have only dropped one.
"At least here in the US, it's pounded into our heads early on that bars = signal level = fewer problems overall. And it's kind of true. Generally speaking, the number of bars being displayed on your cell phone gives a general idea of whether you have a good chance of making a call.
However, there are a number of variables that the phone takes into account when figuring out exactly how many bars to show you in the first place, and in fact, those variables can be (and often are) different among cell carriers, manufacturers, or even different devices from the same manufacturer. Put simply, the number of bars displayed on your phone does not necessarily equal signal level; rather, it would be more accurate to say that the bars are "correlated" with signal level."
Check out these articles for more information. They put it much better than I can.
Four bars? The disconnect between bars and cell signal
Cell Phone Reception Explained: What The Bars Mean - Tested
What Do Cell Phone Signal Bars Really, Really Mean?