I called into my voicemail, and tried to change the greeting to no avail. After a few attempts, I realized that I had had an "extended absence" greeting in effect. Once I switched to a "custom" greeting, I was able to record and activate a custom greeting.
To use Visual Voicemail on your iPhone, open Phone>Voicemail and browse the messages. Tap any message to read its transcription and then tap Play to listen to it. To output the audio, tap Speaker , and then tap Call Back if you want to return the call, or Share to share it with others by forwarding it in a text message, email, or saving it to

2. Open the dial pad. Tap the dial pad icon near the bottom of the screen to bring up your phone's dial pad.
To call your voicemail on an Android phone, simply open your phone’s dial pad and hold your finger down on the “1” key. You can also call your voicemail from a different phone by calling your own number and tapping the pound key. Navigate to your voicemail option if using a cell phone. … Listen to the recorded voicemail instructions. … Press the number on your keypad symbolizing “Yes” when asked if you want to delete your current message. … Select to record your own message if you want, or leave it as the mechanic default message. Step 1: Press # Right after you realize you want to delete your voicemail press the # symbol. It is VERY important that you do not hang up the phone. … Step 2: Listen to Menu. Once you press # on your phone, you will automatically be given access to a menu.