Follow the carrier instructions and enter your Pin or other details if asked by the audio instructions. If you follow these above steps correctly, you will be able to disable the Voicemail on your Android device.
Use these step-by-step instructions to set up your voicemail. And don't worry if you make a mistake — you'll always have the option of backing up and changing your response.

If your carrier supports the iPhone voicemail feature, you can retrieve and listen to your voicemail right from within the “Phone” app and call your contacts back by simply tapping their messages. That type of functionality is pretty neat and useful, because it saves you actual time. If not supported by your carrier, you will not be able to see the visual overview of your voicemail inbox and use any of the related features. Tapping the “Voicemail” tab in your “Phone” app will simply call the number associated with your voicemail box. So let’s get going with creating our custom voicemail greeting on iPhone! How to record your own Voicemail on iPhone Phone → Voicemail → Greeting → Custom → Record → Save
These settings are based on Carrier provider, so you can use these steps on other mobile platforms and services. you can ask your questions that are in your mind in the comment section.