The Whatsapp application itself can only be used on one device. If this is the case, you must first delete the original Whatsapp. Then to install the MB Whatsapp application, you can listen to the following tutorial. - The first step is to enter the settings menu. - Then just select security. - Well, here you can choose the application. - Then check the "Unknown Source" section. - Just open the MB WhatsApp apk in the storage folder. - Finally, wait until the process is completely finished. If it is already installed, then linking the previous Whatsapp account to the MB Whatsapp application is indeed quite easy, yes. Which steps are the same as you install the original Whatsapp.