How come everyone is getting good signals?

I'm getting 3G (not full bar) in PJ and Subang Jaya / Glenmarie area. Got one shop even no signal.

The 3G is spotty. It's data transmission has some sudden stop not continuous. I can't get good 4G signals in PJ. My U Mobile even though have limited 3G and LTE, I can get constant data transfer when I have it.