Does Samsung Galaxy M40 have an in-display fingerprint scanner?

No, the Samsung Galaxy M40 does not have a LED notification light and it is obvious since the device has almost no bezels and no space for a notification light.However, you can download third-party apps to have this feature, check below to know more-Check Full Device Specifications  Samsung Galaxy M40

No, Samsung Galaxy M40 does not support 5G. 5G is pretty new technology in the market, and very few mobiles support 5G.You can check the specs of Samsung Galaxy M40 here: Samsung Galaxy M40

You don't need to enable VoLTE. Insert the Jio (VoLTE enabled) in any slot. By default, VoLTE will be active. If it is not, you can change the network preferences from Network option in settings.Go to Settings > Call Settings (Sim and Network)Tap Cellular networks > Enable Voice over LTE On/ Off.Alternatively, you can follow a much easier way:You can simply dial *#*#4636#*#* Choose Phone information.Click " Phone Information" and Toggle VOLTE Provisioned.Restart the phone and you are done.Specs: Samsung Galaxy M40Samsung Service center: Samsung Mobile Customer Service Center

You can follow the below-mentioned steps to save battery:1. Turn off notification from less used apps:Real notifications are handy in some cases like email. But there is plenty of less important app that wants notification permission. Turn off those notification permissions. To do this Go to settings> Notification and status bar> App preferences. Choose and set important push message such as WhatsApp, what are enabled and disable other apps which you don't use often.2. Turn off GPS:GPS is another battery draining cause. Many apps request location permission using GPS. Turn it off to save your battery. You can use Wi-Fi-based location rather than GPS3. Enable battery saver in Security app:In MIUI 8 security apps comes with lots of feature including battery saver. Enable battery saver in security saver to get ultimate battery experiences.4. Set/Adjust Screen Brightness:Automatic Brightness: It is a good choice for adjusting screen brightness. But setting a constant brightness also save battery life. To set constant brightness Personally I prefer constant brightness and you can access them in Settings> Display> Brightness level.5. Turn off vibration on press:Every time you press on phone display it makes vibration. It is obviously power consuming. Turn off vibration on press to prolong battery life6. Turn off Wi-Fi:Turn off Wi-Fi when not needed. It is not mandatory to turn on Wi-Fi 24/7. It consumes huge battery.7. Turn off Sync:Syncing is also drained battery. Though it is important for apps like email but turn it off when not needed. You can turn in off in Settings>Sync.8. Turn off excessive vibration:Vibration kills your battery life. Try to avoid vibration mode. For app notification, you can turn it off in Settings> Notification and status bar> App notification> Choose only apps you want them to vibrate.9. Turn off auto update:Apps like Google Play store and app store constantly connect to the server to check for the updated app. This process drains battery fast. Turn off auto update to prolong battery life10. Shorten Screen Timeout time:Screen consumes huge battery. You can save some charge by shortening screen timeout time. Head towards Settings> Lock screen and password> Sleep and choose the time you prefer11. Use static wallpaper instead of live wallpaper:You can save some battery by shortening Use static wallpaper instead of live wallpaper Try to avoid live wallpapers.12. Turn on Airplane Mode in low signal areasPhone consumes most battery in week signal area. So, turn on airplane mode when the signal is too poor.13. Keep phone updated:Updated ROM comes with optimization and bug fixes. So, keep your phone updated to prolong battery life.14. Turn on Power saver mode:You can simply swipe the notification bar and turn on the battery saver mode so that the battery usage is optimised.You can check the specs here: Samsung Galaxy M40Service Center: Samsung Service

Yes, Samsung Galaxy M40 supports OTG. USB OTG or USB On-The-Go is one of the most recent technologies that allows you to connect your pen drives and in some cases hard disks to your smartphones and tablets. It has a cable and through that cable, you can directly view and use your pen drive in your smartphones.You can check the specs here: Samsung Galaxy M40Service Center: Samsung Service