I use Samsung Galaxy m30 ...Sometimes when I open or use an app  a blue line appears  at one side of the display.....I just want to know what is this feature    and  how can I use it...   screenshot givenIt's not only in case of games but other norm...

I'm having problems in hiding photos and videos in my phone. Since Samsung's own app "secure folder" dosen't work on Samsung Galaxy m - series. So I want suggestion for any lock app. Hoped to get help..

The most of the galaxy phones have major problem with network coverage....They suddenly decreases speed or stops data totally while showing full network..But this happens with the mid range and the low range smartphones....Higher range smartphones ha...

Last one was galaxy j7 max  ...Currently using m30Loving it......battery, camera, design, service and best is the company support.....Love Samsung...