The telephone systems have the feature named as Voicemail. VoIP is the best example of it. When a receiver is unable to pick up the phone, then the caller can leave the voice message on the receiver’s phone. In older telephonic machines, such messages were stored as a voice message directly, and the receiver can hear them later. In modern telephone systems, such info is being stored on the server of the service provider in the user’s mailbox. It is similar to email in which the messages are saved in the form of audio instead of text.
If you’ve already created a custom voicemail on your iPhone, you can tap Play to see how your voicemail sounds. If you’re interested in creating a new message, tap the Custom button. From here, you can start recording your message by tapping Record and tapping Stop whenever you’re finished. Once you’re finished recording, tap on Play to make sure the message comes across as you’d like and hit Save (in the upper right) to save it as your voicemail.

Cannot delete 1 999 476-5752 from my iphone 6 with ios 12 voice mail. *86 reports no voicemail. The recording has an Asian language message. I have tried network resets with no success in deleting the voicemail.
To change your night greeting on a Samsung OfficeServ 100, 500, 7100, 7200 and 7400 phone systems: Press the voicemail button Press * # 0000 Enter the system password Press 1 to edit system prompts Enter 1002 for the Night prompt Press 1 to listen to the current prompt. If this is not the prompt you want to record press * * If this is the correct prompt press 3 to discard the current recording and begin recording a new prompt. Press 2 when finished and review the greeting. If the greeting is acceptable press # to save Hang up