When you set up Voicemail for iPhone 7, you can enter the Phone app, and then tap on "Voicemail" to access to Voicemail to change for the desired information.
Besides creating an audio file in the right format (Adaptive Multi-Rate), you also need to trick the iPhone to upload your new greeting to the AT&T servers:
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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.
How to Change the Outgoing Voicemail Message on IPhone (iOS 9 or later) Tap the phone icon (the same one you use to make a call). Tap the voicemail icon in the lower right of the screen (it’s the one that looks like an old-fashioned cassette tape). You’ll be taken to a screen that lists all of your recent voicemails; tap on the word
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.
Before you change voicemail greeting on the iPhone, make sure that you have set up the Voicemail on iPhone. Because when you follow the below procedure to change the greetings of the voicemail, you may not found the Greeting option if you haven’t set up the Voicemail yet. How to Change Voicemail Greetings on AT&T, Verizon, T-Mobile and Sprint on your iPhone or Android mobileVoicemail Greetings For AT&T and Verizon Users:Voicemail Greetings For T-mobile Users:Voicemail Greetings For Sprint Users:Can’t Change My Voicemail GreetingCan’t Record Voicemail Greeting How to Change Voicemail Greetings on AT&T, Verizon, T-Mobile and Sprint on your iPhone or Android mobile
On your Android device, open the Google Voice app .At the top left, tap Menu Settings.In the Voicemail section, tap Voicemail greeting.Next to the greeting that you would like to use, tap more Set as active. To change your voicemail greeting: Go to Phone > Voicemail and tap Greeting. Then follow the prompts to change the greeting. To change your voicemail password: Go to Settings > Phone > Change Voicemail Password and then enter the new password you want to use.
Website: https://faq.magicjackforbusiness.com/s/article/How-do-I-record-or-change-my-name-or-voicemail-greeting
Learn how to delete Voicemail messages from your Apple® iPhone® by following these steps.
Website: https://www.tipard.com/mobile/how-to-change-your-voicemail-on-iphone.html
* If you forget your voicemail password, there's no way to reset it from your iPhone. You need to contact your carrier to reset your password. If you insert a new SIM card, you might lose the voicemails that you saved on your iPhone.
I can access my voicemail from my phone just fine. I’m just cheap and used Hangout/Google Voice to save my minutes.
They will appear once you get a new message, so we recommend you leave yourself a voicemail message after updating your Carrier Settings. Tell yourself how stoked you are about your new savings! On Androids: To access your voicemail, press and hold the number 1 on your phone…
5 - Navigate to Config > Mailboxes and edit your mailbox using the pencil icon to the right of your mailbox.
6. Alternatively, from the list of messages, press and hold the voicemail then select “Delete,” then confirm the deletion.
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Depending on which Android phone model you are using, you can dial the carrier code and directly stop the Voicemail service.