Backup WhatsApp MessagesOpen the WhatsApp messaging app on your old smartphone and then press the Menu key and tap the settings. In Setting menu you will see lots of options, click on the “Chat Settings” and then Tap “Backup Conversations”. See the screenshot below:-
Now the backup file is saved on your Whatsapp folder.
Export WhatsApp Messages to New AndroidConnect your Old Android mobile to the PC with USB cable and copy the Whatsapp folder on your desktop. You can find the WhatsApp folder on your phones Internal Storage.
Now move the “WhatsApp” Folder on your New Android device and install the WhatsApp app form the Google play store. Now Open Whatsapp messenger, the Welcome screen will appear just click on I Agree and Continue.
Enter your mobile number to complete the setup process. Once the setup process is done, WhatsApp will automatically detect the old backup files that you move on your phone. Now hit the “Restore” Option and all your old messages are saved on your new mobile with all contacts details and chats.