If they adjusted the bars to show 4 at -110dbm, you have room for only 1 more bar. If you mean adjust downward, I've had good signals with -117dbm, a little less than 1/4 the signal of -110dbm, and I wouldn't want one bar at -110 - that would give me no bars with a usable -117dbm, leading me to think that I had no signal when I did. It is a problem. With GSM (or CDMA), you're not really seeing signal strength in the bars, you're seeing signal quality, and what quality gives you how many bars, and what quality gives you usable signal, vary by frequency, congestion, buildings (multipath can render a cellphone useless at -90dbm), so think of it as "if you have bars you have signal" - but there's no indication of how good that signal is unless you use something like LTE Discovery - and understand what you're looking at. (Remember, maybe 95% of people using cellphones have no idea of how they work, what goes on or anything but what they see. And a signal that varies by 50db [at the edge of "going digital" to standing 25 feet from the tower, or a few feet in front of an antenna face] can't be accurately described in 5 bars. A 10db difference in signal quality [which is the resolution for 1 bar] is ten times the signal quality. And in some phones, even though it's not supposed to work that way, that could be the difference between not working and not being able to find a dead spot.)