Group Sharing
com.samsung.android.mobileservice
Previously, Samsung Experience Service. The legacy version was similar to Samsung Core Services (citation needed).
Can remove safely if you don’t use any group sharing features (shared albums in gallery, etc.).
Handles your Samsung account and is needed to use some Samsung apps features.
It allows you to use Samsung apps, such as Samsung Health, Samsung Pay, Galaxy Apps, Samsung Members, and SmartThings with your Samsung account credentials.