How to Use Same WhatsApp Account on Two Phones
Support for all my friends and family members that many of us were waiting for the option to use WhatsApp on multiple mobile phones on the same SIM number.
After introducing the much-desired option of using a single WhatsApp account on secondary devices in 2023, WhatsApp is now rolling out another major feature.
The demands of many have finally been granted: you can now use a single WhatsApp account on up to five phones. Each additional phone is linked to the account in the same way that web browsers, tablets and desktops are linked to WhatsApp.
How to use the same WhatsApp account on different devices
1: Download and install WhatsApp on the secondary device.
2: Connect WhatsApp to your existing account.
3: On the primary device, open Linked Devices.
4: Scan the QR code from the secondary device.
If you already have WhatsApp installed, uninstall it and reinstall WhatsApp. The latest version of WhatsApp needs to be used in two phones. The service is available for Android and iPhone users. Only one registered phone number can be used to verify your WhatsApp account.

Please note that if you have a dual SIM phone, you still need to choose a number to verify with WhatsApp. It is not possible to have two verified WhatsApp accounts with separate phone numbers.
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If you frequently switch your WhatsApp account between devices, you may be prevented from re-verifying your account at some point. Please do not substitute between different devices and numbers.

WhatsApp Messenger 2.22.24.79 by WhatsApp LLC
Each phone connected to the network works independently, guaranteeing end-to-end encryption of messages, media and calls.
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About using one WhatsApp account on multiple phones, or with multiple phone numbers:
Check WhatsApp Official Notification: Check here.