How to block and unblock contacts on your Samsung Galaxy smartphone

1.1 Go to Contacts

1.2 Select the contact you wish to block

1.3 Tap More

1.4 Tap Block contact

1.5 Tap Block to confirm

1.6 Similarly you may Unblock the contact

2.1 Go to Phone app

2.2 Tap More

2.3 Tap Settings

2.4 Tap Block numbers

2.5 Tap Add phone number and then enter a phone number

2.6 Tap '+' icon to add the number in block list

2.7 Tap ' - ' icon to remove the number from block list

2.8 Tap Recents or Contacts, if you wish to add a number from there

3.1 Go to Phone app

3.2 Tap Recents

3.3 Tap the phone number you wish to block

3.4 Tap Details icon

3.5 Tap Block

3.6 Tap Block to confirm

3.7 Tap Unblock to unblock the number