How to Enable WHATSAPP Security Notification

To get notification in case of change in mobile or re-installation of WhatsApp by your Contact, to ensure End to End Encrypted Chat

Android

1. Open WhatsApp > Settings.

2. Tap Account> Security notifications.
3. Turn on Show security notifications on this device.

iPhone

1. Go to WhatsApp Settings.
2. Tap Account> Security Notifications.
3. Turn on Show Security Notifications on This Phone.

Web and Desktop

1. Open WhatsApp > click Menu

or

above your chats list > Settings.

2. Click Security.
3. Turn on Show security notifications on this computer.

Disable security code notifications

Android

1. Open WhatsApp > Settings.

2. Tap Account > Security notifications.
3. Turn off Show security notifications on this device.

iPhone

1. Go to WhatsApp Settings.
2. Tap Account> Security Notifications.
3. Turn off Show Security Notifications on This Phone.

Web and Desktop

1. Open WhatsApp > click Menu

or

above your chats list > Settings.

2. Click Security.

Turn off Show security notifications on this computer

(via WhatsApp)

Also Read: Here is How to STOP SPAM & UNSOLICITED SMSs AND CALLS