m30s is focused on battery , storage and display. that's why the aperture of camera is 2.2

while downloading updates from mobile data , sometimes it skipped and the whole data was not downloaded, at that time this problem happens you should visit samsung care center and next time try to download updates by wifi

you can use filter option to enhance your selfie photo

samsung j7 nxt have a contract with knox security but m30s doesn't have contract with knox that's why it lacks many samsung apps like samsung link sharing, s secure etc

ye issue normal hai un sim me jiske network fluctuations jyada hote hai , iska solution hai opt for a better sim .