Thank you for reaching out to the Samsung community! We would like to inform you that Samsung messages application is an inbuilt application and get updated by the device software update. You can also check for the update from the Galaxy App store.
Be sure to hit ♡ when you find an answer that works for you. For further assistance, you can get in touch with us via Live Chat option by following- http://livechat.support.samsung.com/Customer_new/IN. You can also connect us via Samsung Members web community by following mentioned url-https://community.samsungmembers.com/en_IN#/
