For small businesses, there are a variety of voicemail service providers you can use that offer different features. From transcription and voice to text to more convenient features of handling multiple phones through one number, availability varies by service. Shared voicemail and call routing is intended for multiple access and directing calls to one or multiple phones. Mobile apps are also available that allow you to check your messages from your phone. The below infographic outlines the current state and trends of voicemails.
Website: https://www.mightycall.com/blog/the-best-services-to-record-a-voicemail-greeting-for-business/

Another worth considering trick is to remove all the old voicemails that are consuming the storage and creating multiple dilemmas like this. To delete the voicemail here are the steps, Open the Phone app. Tap on Voicemail at the bottom tab. Then tap on Edit at the top-right screen. Select All the Voicemails and at last tap Delete.
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.