You do need a visual voicemail for the last option. That is something that is provided by your cell phone provider and most cell phone provider have it by default. if you don't see it, call them and see if you can add it.
The very first thing to be checked is, have you set up the voicemail earlier or directly recording the voicemail greeting? If you haven’t already set up the voicemail and unable to record voicemail greeting, then go to the top of the page and learn how to set up voicemail on the iPhone.
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To pick the check box next to ‘Mark Default Greeting,’ tap the check box to the right of the check box.
Updates for Safari, FaceTime, and many other apps, Universal Control to let a single mouse or trackpad control multiple devices, new Shortcuts app, machine-learning Live Text detection and Visual Lookup, and more.
Step 4. You will be shown a list of voicemails you can use. Choose one by tapping the down arrow, and then tap “Set as active.”
If you persistently can’t save your greeting, you may need to reset your phone’s network settings. The iPhone needs to access your network’s data connection to save changes to your voice mail configuration, and if it can’t connect to 3G or 4G, it won’t save the changes.
Your voicemail is set up with a default greeting, but you can record a personal greeting any time you want.
How do I find out my Iphone voicemail password? Change your voicemail password: Go to Settings > Phone > Change Voicemail Password, then enter the new password. If you forgot your voicemail password, contact your wireless carrier. Change the alert for new voicemail: Go to Settings > Sounds & Haptics or Settings > Sounds.
At the moment we are in process of improving it and will definitely provide more liberty to edit voicemail options. However if you are looking to turn it off completely, please contact us via chat or call and we can help you with it.
Website: https://appletoolbox.com/iphone-tips-how-to-call-my-voicemail-from-another-phone/
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
Note: The maximum greeting length is 60 seconds. Once the limit is reached, the recording will be saved automatically.
Standard greeting with phone number: "At the tone, please record your message to [phone number]."
So far you probably had a generic voicemail greeting on your iPhone and want to change it to a personal voicemail greeting and with most carriers you don’t even need an additional voicemail recording app and can record a custom voicemail greeting directly on iPhone.
4. If you don't have a voicemail already set up, "Default" will be checked. To set up your greeting, check "Custom."
Most of the time, an update to your carrier’s voicemail app or settings will cure the issue; however, it is important to confirm that your voicemail number is appropriately configured before proceeding any further.
Website: https://www.payetteforward.com/my-iphone-voicemail-password-is-incorrect-heres-the-fix/