How to backup contacts and sms messages from Samsung Galaxy Tab S3 LTE 9.7" (SM-T825)
We used PhoneCopy.com service for this guideline. Using it, your can backup your contacts from your Samsung Galaxy Tab S3 LTE 9.7" (SM-T825) easily. The whole backup, including the settings, can be done in several minutes.
Some additional tips:
You can easily remove duplicate items among your contact list or SMS messages. Just go to the Contacts (or SMS) section and choose More Actions -> Search for duplicates. Detailed wizard will help you to solve this kind of problem easily.