Iphone7plus wechat address book letter index vibration feedback how to switch, sometimes not?

Mobile phone settings: Settings-Notifications-WeChat (power on)

Wechat Settings: I-Settings-New Message Notification (All on)

After the above settings are confirmed, restart the system: press and hold the power button +Home keyboard for more than 5 seconds at the same time.

IPhone will automatically restart, so that's good.

How to solve the sudden black screen of Apple iphone7plus?

1. Press and hold the Home button for 6 to 8 seconds. Quitting any programs may block your iPhone.

2. Press and hold the power button and the home button in the middle of the main screen until the white apple logo appears, then you can turn it off and turn it on.

3. If you press the power button and the home button at the same time, you can't flush the crashed iPhone, then plug it in and press the second button. One thing to note is that if your mobile phone needs to be turned off due to low battery power, please charge it and restart it when the battery power reaches more than 5%.

4. Under normal circumstances, you can connect the iPhone(USB) to the computer and press the HOME power button for about 10 seconds to restore the options. Press the recovery ok button, and Apple iPhone7 will add recovery.