If a phone rings once and then goes to voicemail or rings only briefly, it You can't definitively know the cause of a phone barely ringing and going to voicemail because neither a phone company nor the phone's operating system provider will tell you if your phone number is blocked.
With notifications, you're alerted when you miss a call or receive a voice mail message. You can decide how and when you want to be alerted. For example, you can receive an email when you miss a call or get a text message when someone leaves a voice mail. By default, you'll receive an email anytime you miss a call, but text messaging notifications are turned off.

Instruction for installation of Voicemail greeting on Samsung S10Choose telephone application. Users maybe don’t mention it, the advice is to click keyboard beneath the screen.Push the key “one” for entering voice mailbox option.In the situation, it is initial experience to use function, you are supposed to type the password. They’re last four numbers of your mobile.Differently, a user is offered to generate another one. In this way type from four to seven symbols, that are easily remembered, but unknown for other people.Next, create another welcome message and preferable name.As soon as these adjustments are finished, soft of Voice mail is accessible.Advices for modifying the greeting on Samsung
Read more about stopping your answerphone kicking in too quickly here: How to stop my iPhone going to voicemail after three rings