I have used celcomdigi line on Samsung Galaxy A55 and found that the 5G line is very unstable, in most of the time the line will be in 4G+ mode only, but when I use the same simcard on another phone, it is stable on the 5G line, I have checked the settings and nothing needs to be changed, please help.
some things cannot be change and you might need to accept it. here is why. in order for LTE/4G/5G to works it will need good antenna gain, which this antenna embedded inside your phone. Every phone has its own antenna for LTE/4G/5G/2G, the different between phones are the "gain". Higher antenna gain will lead to stable connections.
In your case, maybe A55 antenna gain is not good as other model. different samsung model also have different numbers
