Slow motion ha been introduced in Samsung A series smartphones. Samsung is trying to enter the mid budget range with very good phones.

There is no problem with M30 mobile, it might be a simcard issue, pls call your customer care and ask them, maybe there is a tower upgrade going on in your area which is causing the issue.

Check out for your settings and apps that are running in background, put apps to sleep that u don't use.

Samsung actual ruined m40, m30 has got better screen and a huge battery and m40 has got just one new thing which is a punch hole camera, i don't think it even matters, m30 has got an AMOLED display which is way better than the LCD screen on M40, U ca...

M30 is better than M40 in all aspects