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To recover lost data from Samsung Galaxy S6, you should check your backup first, Whatever data you have lost or WhatsApp messages, they can be recovered with ease if you have backup. If you don't have any backup of your lost data then you should use Samsung phone data recovery [androiddata-recovery.com], a professional tool that easily retrieves lost data from Samsung phone. No matter for whatever reason your data was lost, using this powerful tool will work effectively to retrieve lost files from Android phone.

To transfer whatsapp messages from Android to Android [samsung-messages-backup.com],you could use Google drive,Local Backup,or Samsung Data Transfer.You could use this way to make it.There is is detailed guide in this article,you could refer to it.