How to cast my Xiaomi Redmi 6A screen on TV ?

You don't need to enable VoLTE. Insert the VoLTE enabled SIM and by default, VoLTE will be active. If it is not, you can change the network preferences from Network option in settings. You can also check the complete specs here: Xiaomi Redmi 6A

To Increase the speed of your slow Android phone here is the guide to speed it up in 5 Minutes 1. Close all your unused apps. Closing all the apps which you are not using saves a lot of memory usages which can be utilized by other apps to make it run faster. 2. Clean all the app cache Download Clean Master software from the Play store Press Junk Files and let it do its work  After that press on Phone Boost option. 3. Disable the Animations 1. Go to "Settings" 2. Then Go to "About phone" 3. Tap on " Build Number" 7 times. 4.  Then Go back to settings and Tap on " Developer Option" 5. Scroll Down to "Windows Animation Scale". as shown in the Image below 6. Tap on "Animation Off".   You can check the complete specs of this phone: Xiaomi Redmi 6A

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 is 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 GPS 3. Enable battery saver in Security app: In MIUI 8 security apps comes with lots of feature including a 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 the press: Every time you press on phone display it makes vibration. It is obviously power consuming. Turn off vibration on press to prolong battery life 6. 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 life 10. 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 prefer 11. 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 areas: Phone 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 optimized. You can see full specifications here: Xiaomi Redmi 6A

Xiaomi Redmi 6A comes with a 3000 mAh Li-ion battery. No, it does not support fast charging.You can also check the complete specs here: Xiaomi Redmi 6A

Yes, Xiaomi Redmi 6A supports OTG. USB OTG or USB On-The-Go allows you to connect your pen drives and in some cases hard disks to your smartphones. It uses a cable and through that cable, you can directly view and use your pen drive in your smartphones. You can also check the complete specs here: Xiaomi Redmi 6A