1- First Of All Open Your Whatsapp > Go to Settings > Account > Change number .
2- Enter your old phone number in the top field and then your new phone number in the bottom field.
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2). How to Spy on Whatsapp Messages
3). How To Use Whatsapp Without Number [ 2015 ]
4). Whatsapp for Java Phones
5). How Can I Get All My Deleted WhatsApp Messages Back
6). Send WhatsApp message without using any number
7). 250 Best Whatsapp Status Updates, Quotes and Messages
8). Whatsapp Tricks and tips That you must know