Did you backup your contacts before? Or do you use Gmail? You can restore the lost contacts with a backup or gmail. There are a lot of tutorials on this and here is the one that help you recover lost contacts from LG G3, which also supports other LG phone and tablets.
Androidphonesoft has a great program on that. You can recover lost sms from samsung based smartphone and tablet such as Galaxy S7, S6 and Galaxy Note 4. Besides sms recovery, you can also restore other types of data by using the program.
The user interface is ugly, lol. Androidphonesoft has a better program for retrieving deleted files form Android phone. It supports a lot of Android smartphones and tablets. Android version 6.0 is also well supported.
