To recover lost contacts,sms,phoots,videos from Samsung Galaxy mobile phone,you need to use a Android data recovery software.
Download a reliable file recovery software like Android Data Recovery
. The recovery process will become smoother with this easy-to-use program. You can use it to retrieve not only deleted contacts as well as SMS messages, photos and video
from your Samsung Galaxy or other rooted Samsung phones with Android operating system.
Read this use guide: Recover contacts from Samsung Galaxy
Recover contacts from Android
Recover SMS from Samsung Galaxy