Enable Call Forwarding:

  1. Access the “Settings” menu
  2. Tap “Call” > “Call forwarding
  3. Choose “Always forward” and enter the phone number you want to forward calls to
  4. Tap “Enable

Forward Calls (Conditional):

  1. Tap “Apps” on the home screen
  2. Go to “Settings
  3. Tap “Call” > “Call forwarding
  4. Select to “Forward when busy”, “Forward when unanswered” or “Forward when unreachable
  5. Enter the phone number you want to use for call forwarding
  6. Tap “Update” / “Enable

Turn Off Call Forwarding:

  1. Open the apps drawer and go to “Settings
  2. Tap “Call” > “Call forwarding
  3. Tap “Always forward” (or select a different option)
  4. Tap “Disable

Block Calls:

  1. Open “People
  2. Tap “Menu” > “Manage contacts
  3. Tap “Blocked contacts” > “+
  4. Perform one of the following steps:
    • To block a contact: tick the check box next to the contact and tap “Save”. (Optionally, tap “OK” to save the contact information to another account)
    • To block a phone number: enter it and tap “OK

Unblock Calls:

  1. Open “People
  2. Tap “Menu” > “Manage contacts
  3. Tap “Blocked contacts
  4. Tap “Menu” > “Remove blocked contacts
  5. Select the contacts you want to unblock and tap “Delete

Block Messages:

  1. On the home screen, tap “Messages
  2. Tap and hold the message thread exchanged with the contact you wish to block
  3. When prompted with the “Message options” pop-up, tap “Block contact

Unblock Messages:

  1. Launch “Messages
  2. Tap “Menu” > “Block list
  3. Select the contact you want to unblock
  4. Tap “Menu” > “Unblock contacts

See More: HTC One M9s: Forward Calls; Block Calls & Messages