I downloaded opensignalmaps. Seems like a neat tool to show the direction and strength of your signal (cellular and WiFi).
What is confusing is what settings you should allow. Do you suggest allowing data share or no data sharing? What settings will noticeably slow down the phone in general with apps?
Also, I noticed a few apps run in the background. When do you have too many apps that will affect performance?
Can you trust any app that Google Play offers?
Please forgive my lack of experience and novice questions.