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.
Website: https://forums.att.com/conversations/apple/iphone-8-and-voicemail-custom-greeting-not-working/5df01bbfbad5f2f606f690fd
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So, this is the first yet the most effective way of changing the voicemail settings from Spanish to English. In this case, you need to use the voice mail system and follow the below-mentioned steps; First of all, you need to dial the voice mail system by calling 888-234-6786 The new window will open up Enter the password Now, press 4 and it will open the personal options Press one again to open the personal profile Then, choose the change language option by pressing two Choose one and the English language will be set
9. Verizon Visual Voicemail. This application has a minimalistic design and strictly defined functionality. When using Verizon Visual Voicemail, you get only voice mail and nothing extra.
Open the dial pad on your mobile phone. You can see the Voicemail hot button (in most cases, it is the number ‘1’ on the dial pad). Press & hold that button, and it will take you to the Voicemail directly. You can also go to the Voicemail from the phone menu.
To change your greeting: Call into your voicemail. Press 3 for personal options. Press 1 for greetings or mailbox name. Choose what you want to do: Press 1 to record a personal greeting; Press 2 for a temporary greeting; Press 3 to use a system-generated greeting; Press 4 to set up a greeting when your phone is busy; Follow the voice prompts.
5. Change mailbox settings and greetings. Access voicemail. From the Main Menu, press 4 for Mailbox Settings. Press 3 for Greetings and follow the prompts. Set up sub-mailboxes.
This solution worked for me: https://www.reddit.com/r/apple/comments/3lm2eh/difficulty_changing_voicemail_gre eting_in_ios_9/cyngnjr
Tap on the Google Fi app on your device’s home screen. Tap on the Account tab. Under Phone settings, tap on Voicemail. Tap on Manage greeting. Tap on the Microphone button to record a new voicemail message, or skip ahead to step 8. Tap on Keep to save the new message, or on Redo to try another one.
Important: In some countries or regions, deleted messages may be permanently erased by your carrier. Your voice messages may also be deleted if you change your SIM card.
10. Reset Time Zone and set Date & Time automatically. For most users, it’s recommended to let your device automatically set the time. To make sure that your time zone and similar settings are correct
To update the Carrier settings and iPhone, a Wi-Fi connection is mandatory. Open the Settings app > General > Software Update, this will help you update the iPhone.
Website: https://www.att.com/support/smallbusiness/article/smb-wireless/KM1009187/
You can play a voice message at different speeds and pause/resume the message, using desktop client visual voicemail, or by dialing into their voicemail. Pressing a certain key on your phone controls how you can hear the voicemail: Read your voicemail transcription
5. Choose My Carrier, if it isn’t chosen already. Or, if it’s the only option, you’re set.
Website: https://www.iphonelife.com/content/how-change-your-voicemail-greeting-your-iphone
To block from a text: Open a text from the contact that you want to block tap More options People and options Block [number] Block.To block from a call or voicemail: Open a call or voicemail from the contact that you want to block tap More options Block [number] Block. In the “Account” tab, under “Phone settings,” tap Voicemail. Turn on “Call to listen.” Enter your PIN and tap Save.