I did mention coverage and why I have a Yagi antenna and two Wilson boosters..You seem to not know how an operating system can change reception also and why I chose to go with Google and get OS updates monthly which can help reception or make it worse..
PC Mag wrote:
As for the users who are having signal issues with their iPhone on iOS 12, PCMag’s testing shows that it’s all tied to the software. As you can see in the chart below, iPhone X units running iOS 12 seems to suffer from some sort of software-released issue when signal strength is weak.
Google/Samsung/Motorola/LG They all have issues sometimes with there OS and updates..Some like Google send a fix immediately and others do not and you have to live with the thing until they fix it..Samsung has been some of the worst in updating there phones to the currant Android system which now is Android 10 with 11 coming out in July probably on the Pixel 4a..
If your running Android which Samsung uses,your at the mercy of Samsung for updates which could include radio adjustments..It could be a good one or a bad one..Your phone could be working perfectly now but download a new system update,and it could be terrible..Samsung has in the past not updated very quickly while Googe who is Android,does it every month for any issues reported..