Open the Phone app
Tap the three-dot menu or Settings
Select Voicemail
Tap Voicemail settings or Advanced settings
Set up your voicemail number if prompted
Press and hold the 1 key to call voicemail
Follow the voice prompts to create a PIN
Record your greeting when prompted
Save your voicemail settings
Test by calling your own number from another phone
Check voicemail by opening the Phone app and tapping Voicemail