Whats App Restore

Hi Everyone on the steem Platform I took my old phone to a
repair shop to get repaired and now I have a new phone that i'v been using for
more than a month. So i have a lot of chats in my new phone and i want to
install all my chats from my old phone's whats app chats to my new phone (combine the two phones chats) that
i had been using for more than a month. How do I go about that?