Your device automatically transfers all unanswered calls to
voicemail, even if your device is in use or turned off. As soon
as your battery is charged and the micro SIM card inserted,
activate your voicemail account.
Important!

Always use a password to protect against
unauthorized access.
For new users, follow the instructions below to set up voice
mail:
Note: Voicemail setup may be different depending on your
network.