2. Press and hold the "1" key on the keypad. If it’s your first time setting up voicemail, you’ll likely see a message that says “No voicemail number is stored on the card.” If pressing this button dials your voicemail service, listen to the prompts for instructions on completing the setup process.
If you want to re-enable the Voicemail service on your Android device, then you can easily do that from your phone settings. I hope this guide will help you in deleting your old Voicemail greetings and record the new ones for the callers.

If you don’t know what to say in your voicemail, here’s a few pointers to get you started: Make sure that you’re not yelling into the phone and the message is recorded in a somewhat quiet area. If the message is for work, try to keep it professional and avoid mistakes, if possible. If you’re working in retail, apologize for not picking up and note that you will call them back. Regardless of your occupation, try to keep the message short. It shouldn’t be longer than 25 seconds. If the voicemail is personal, feel free to leave a silly, short message that lets the caller know it’s you.
Open the Phone app . Press and hold “1” to call your voicemail. Enter your PIN and press “#”. Press “*” for the menu. Press “4” to change settings. Press “1” to change your greeting. Follow the recorded instructions. How do I change my voicemail message? From the Home screen, tap the Phone icon . Tap Voicemail then tap Greeting (upper-left). Greeting is located in the top-left corner of screen. Tap Custom to record a greeting. Enabled when a checkmark is present. Tap Record to begin recording the custom greeting message. Tap Stop to end recording then tap Save. Call *86 (*VM) from the handset or the 10-digit mobile number from another phone. Follow the instructions for choosing the language options then press the # key to confirm the choice. When prompted, enter the 4-7digit password then press the # key. When prompted, say the signature (or name) then press the # key. Open your Android’s Phone app. It usually looks like a phone receiver at the bottom of the home screen. Press and hold the 1 key on the keypad. Tap Add number. Tap Service. Tap My carrier. Tap Setup. Tap Voicemail number. Type your mobile phone number and tap OK.