Block Incoming Calls:

  1. Launch “Contacts
  2. Go to “All Contacts
  3. Select the phone number/contact you want to block
  4. Tap “Edit” > “Menu” and enable “All calls to voicemail

Unblock Incoming Calls:

  1. Open “Contacts
  2. Access “All Contacts
  3. Select the contact you want to unblock
  4. Tap “Edit” > “Menu” and disable “All calls to voicemail

Block Incoming Messages in Google Messenger:

  1. Open the apps drawer
  2. Launch Google “Messenger
  3. Select the message thread exchanged with the contact/phone number you want to block
  4. Tap “Menu” > “People & Options
  5. Tap “Block [phone number]” > “OK

NOTE: The conversation thread will be archived, and all future messages from the blocked contact/number will be added to archives. Additionally you will no longer receive notifications for archived messages.

Unblock Messages in Google Messenger:

  1. Launch Google “Messenger
  2. Tap “Menu
  3. Go to “Archived
  4. Select the conversation thread exchanged with the contact/number whose messages you want to unblock
  5. Tap “Menu” > “Unarchive
  6. Tap “Menu” again and access “People & Options
  7. Tap “Unblock [phone number]”

Enable Call Forwarding:

  1. Open “Phone” and tap “Menu
  2. Tap “Settings
  3. Access “Call forwarding” (NOTE: this option might not be available if it isn’t supported by your carrier)
  4. Edit or enter the phone number you want to forward calls to
  5. Tap “Enable

Enable Conditional Call Forwarding:

  1. Launch “Phone
  2. Tap “Menu” > “Settings
  3. Tap “Call forwarding
  4. Choose to forward incoming calls “When unanswered”, “When unreachable” or “When busy
  5. Enter or edit the phone number you want to use for call forwarding
  6. Tap “Update” / “Enable” to confirm

Turn Call Forwarding OFF:

  1. Launch “Phone
  2. Tap “Menu” > “Settings
  3. Go to “Call forwarding
  4. If necessary, select the forwarding option you want to turn off and tap “Disable

See More: ZTE Max XL: Block/Unblock Calls & Messages; Manage Call Forwarding