How to Recover Old WhatsApp Messages
How to backup or transfer WhatsApp chat data on your new phone
How to Import WhatsApp Chat Fast and Effortlessly
Connect iPhone and Android-based device with a USB OTG cable.
After verifying the number, WhatsApp will search for the local backup, and when prompted to restore your chats tap RESTORE.
You are more than welcomed to tick any other option if you feel you need to recover more than just the messages on WhatsApp.