If the you haven't changed your personal greeting, a default system greeting will be played for callers. For example, "Please leave a message for John Smith. After the tone, please record your message. When you finish recording hang-up or press the pound key for more options."
After you have entered the above number, tap on the "Call" button, and the new number will be set. OK now all your voicemail will be sent to the new number.
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When you reset network settings, all of your iPhone’s Wi-Fi and cellular network settings will be erased. This includes your Virtual Private Network (VPN) settings, your Bluetooth devices, and your Wi-Fi networks — so make sure you write down your passwords first! We do this step because it can be very difficult to track down the exact source of a software problem, so we reset all network settings.
T-Mobile: T-Mobile has a similar story to tell as Verizon. Instead of allowing you to set up a specific basic voicemail, it instead directs you to Apple to set up Visual Voicemail. I dont see anything that you have written when I try to set up voicemail on my new Iphone11. I tap on voicemail and the only option is 'Call voicemail' … then it doesn't accept my mobile number.
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.
Another worth considering trick is to remove all the old voicemails that are consuming the storage and creating multiple dilemmas like this. To delete the voicemail here are the steps, Open the Phone app. Tap on Voicemail at the bottom tab. Then tap on Edit at the top-right screen. Select All the Voicemails and at last tap Delete.
Website: https://www.republicworld.com/technology-news/mobile/how-to-set-up-voicemail-on-android-learn-to-change-your-voicemail.html
See your voicemail messages presented in a list with the number that left the message, the date and message length; See at a glance who called you, if you have their name stored (private numbers aren’t shown) Listen to the message you want to hear first, without going through them all; Replay the message if you missed anything
To record greeting, it is mandatory to have a strong internet connection. Alongside, even if the network connection is perfect, then switch to Wi-Fi to Cellular data or vice versa.
When leaving a voicemail, hanging up sends it. The other person listens to the exact same audio file that you recorded by leaving the voicemail on that automated system, which just so happens to be the same exact system playing back that audio file as output for the intended recipient.
Website: https://www.wikihow.com/Reset-or-Change-Your-Voicemail-Password-on-an-iPhone
The process is very simple. You'll just have to click the green phone icon, the same place you make calls, and navigate to the voicemail screen. On the voicemail screen, you'll see a greetings option on the top left.
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Website: https://forums.macrumors.com/threads/ios-9-voice-mail-greeting.1921761/
Website: https://forums.att.com/conversations/apple/iphone-8-and-voicemail-custom-greeting-not-working/5df01bbfbad5f2f606f690fd
7. Once your voicemail announces that setup is complete, you can hang up the call.