: Using modified apps violates WhatsApp Inc.'s terms of service, which can lead to your account being temporarily or permanently banned.
: You can use two different WhatsApp accounts on the same mobile device. How to Install GB WhatsApp on Android what-is-gb-whatsapp-and-how-to-install-it
: Open your official WhatsApp, go to Settings > Chats > Chat Backup , and perform a backup if you wish to transfer your data. : Using modified apps violates WhatsApp Inc