Samsung Galaxy S7 User Manual page 67

Block a Number
By adding a caller to your Block list, future calls from this number are
sent directly to your voicemail, and messages are not received.
1. From a Home screen, tap
2. Tap the caller you want to add to the Block list.
3. Tap More > Add to block list:
You can also modify the Block list in Settings:
► From a Home screen, tap
blocking > Block list.
Calling
Phone > Log.
Phone > More > Settings > Call
56 Make and Answer Calls