iOS update 12.4.7 issues

Protect & Prolong life of your iPhone's Battery:

1. About the battery usage on your iPhone, iPad, and iPod touch ...
2. Batteries - Maximising Performance - Apple (IN)
3. iPhone Battery and Performance

Try some of these options too.

1. Avoid Screen Mirroring
2. Put on Low Power Mode
3. Put Auto Lock On (1 min):- with low power mode it will be 30 Sec
4. Put Auto Answer Off
5. Disable Push notifications for apps you do not use often
6. Keep your iPhone Face down to prevent notifications to light up screen
7. Enable Auto Brightness:- Settings > General > Accessibility > Display Accommodations > Auto-Brightness [Enable]
8. Manually lower brightness from Control Center
9. If you Want to watch continuous Video. Stream it on TV or a Monitor
10. Don't force close apps; Apps which are not on frontend screen are paused by the system to save energy. Apps require more energy to re-launch. Apps which are open in the background use large memory is a myth and quitting them is counterproductive
11. Location services to be allowed only while using the app
12. Set your iPhone to fetch email and calendar data from internet less frequently
13. Turning off Background App Refresh 
14. Charge before it drops below 20-30%
15. Try connecting to trusted Wifi where ever available in stead of Cellular
16. Enable Airplane mode in areas with bad cellular and wifi coverage. Your phone keeps trying for reconnection with the missing / weak network. This uses lot of energy
17. Switch off Wifi & Bluetooth while in Roaming or Not in Range
18. Enable "Wifi Assist" : Settings > Cellular or Settings > Mobile Data > Wi-Fi Assist [Enable]
19. Periodically Check your Battery Health (Settings > Battery > Battery Health)

rajshree san francisco wrote:

email not loading,

If you can't receive email in the Mail app on your iPhone, iPad, or iPod touch, there are a few things you can try.

...

Make sure that your Notification settings are correct for the Mail app:

• Go to Settings, then tap Notifications.
• Tap Mail, then tap an email account.
• Adjust your Alerts, Sounds, and Badges.

If you can't receive email on your iPhone, iPad, or iPod touch ...

rajshree san francisco wrote:

new iMessages are not sending,

Please check your internet connection

For your Internet connection.

• Over Cellular: contact your Carrier (Cellular Service Provider). The agency who issued the SIM to you
• Over WiFI: Contact your ISP (Internet Service Provider), the agency who provided the Internet Service on your Modem/Router to you

I have iPhone 4S iOS 9.3.6, iPhone 6 iOS 12.4.7, iPhone SE iOS 13.5.1, iPhone 8 iOS 13.5.1 and an iPad Pro iPadOS 13.5.1. Prior to that I had iPhone 3GS which I have stopped using because it is carrier locked.

I have been updating all these devices whenever a new iOS is released. I have never encountered any issue whatsoever after any update 



rajshree san francisco wrote:

apps not working,

Troubleshoot here --> If an app unexpectedly quits, stops responding, or won't open ...

rajshree san francisco wrote:

iMessages disappearing,

Settings > Messages > Keep Messages [Chose your option]

Watch the GIF below