The cause may be down to the phone or the voicemail application. To clear the phone’s app data:
Apple has officially retired Beats Updater, the software utility that lets users update the firmware of their Beats Wireless headphones, earphones, and speakers. Beats Updater allows users to plug their Beats product directly into the USB port of their computer to check for firmware updates online, but with Apple's growing tendency to deliver over-the-air updates to wireless products via iOS ...
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Website: https://www.reddit.com/r/apple/comments/3lm2eh/difficulty_changing_voicemail_greeting_in_ios_9/
9. Hang up. Once you've selected a greeting, press the red End Call button to hang up and exit your voicemail system. There you have it! You now know the basic steps for changing your voicemail greeting on your Android phone.
Website: https://www.dummies.com/consumer-electronics/smartphones/droid/how-to-set-up-carrier-voicemail-on-an-android-phone/
You might experience issues while recording custom voicemail greetings if hardware on your iPhone, such as the microphone, is blocked or damaged. Carrier requirements
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2. Select the menu icon, it’s usually the three-dotted icon found towards the top-right hand corner.
My personal greeting has been set for my MetroPCS phone but I peope can`t leave me a voicemail?
I can’t answer the phone right now, but if you leave me a message with your name and phone number, I will return your call as soon as possible. You have reached Jim Bucki. I can’t take your call at the moment but please don’t hesitate to leave a message after the tone. I will return your call as soon as I am able.
If you want to change that, follow these steps: 1. Press the voicemail button on your phone or dial *98/*99 to access the voicemail menu. 2. Press 0 for Mailbox Options and then press 5 to change the password. 3. Enter your new password of at least four digits and then press #. 4. Re-enter the new password and then press #.
Website: https://www.telstra.com.au/support/mobiles-devices/messagebank-call-forwarding-ring-time
If your voicemail has been set up and you are unable to change your greeting through the 'Voicemail' tab, dial *86 then choose option 4 to change. From a Home screen, tap the Phone app . If an app isn't available on your Home screen, swipe left to access the App Library. Tap Voicemail then tap Greeting (upper-left).
From the Android Mobile App: Click the More button at the top left of the mobile app. Select Voicemail. Click Folder with Music Icon located at the top of the mobile app. Click the Record button, give the recording a title, and click OK. The system will call your extension. Answer the call and follow the prompts to record your new greeting.
Website: https://forums.att.com/conversations/att-phone-features/how-do-i-change-my-voicemail-greeting-message/5defd78dbad5f2f60659eaaa
Because each carrier is distinct, please let us know if these processes are different for you in the comments section. Checking the Phone if there’s an ERROR on Voicemail Check it out on your phone (If No Data or Wi-Fi Connection is Available)
You can change your voicemail password from your iPhone by calling (800)-922-0204. You’ll reach an automated customer service menu which will allow you to change your voicemail password. To learn more, check out Verizon’s support article on the topic.
On another phone: Dial your own mobile number, press * or # (depending on your carrier) to bypass your greeting, then enter your voicemail password.