This is an Apple bug that has been there for YEARS, and they STILL refuse to address it!!!
Website: https://www.att.com/support/topic/local-long-distance/topic_landlinehomephonesup-topic_voicemail1
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This solution worked for me: https://www.reddit.com/r/apple/comments/3lm2eh/difficulty_changing_voicemail_gre eting_in_ios_9/cyngnjr
1. Towards the top of the screen, select the trashcan icon. A checkbox towards the right of each voicemail message in the list will appear.
Website: https://support.line2.com/hc/en-us/articles/203499273-How-to-record-a-custom-voicemail-greeting-on-Android
When recording a personalized voicemail greeting on your office phone, your greeting should include only the company name and your extension number. When recording a personalized voicemail greeting on your office phone, your greeting should include only the company name and your extension number. State your name and spell it out if you’re asking callers to follow up with written correspondence. State your company name and department name. Let callers know that you cannot take their call right now. Invite them to leave a message. What should I record on my work voicemail?
I just tried to set up voice mail and I got a message saying it was not available for users roaming on T-Mobile’s network! Please get this fixed! Something as basic as this should not be an issue. It almost makes want to consider another carrier.
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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.
Press and quickly release Volume UP button. Press and quickly release Volume DOWN button. Press and Hold the SIDE button until an Apple logo appears and then release the Side button (Can take up to 20 seconds. (DO NOT release Side Button when invited to Slide Power OFF).
One of the best and quick fix to this issue is to turn off Wi-Fi for once and switch to Cellular data connection and then try to change the default greeting to custom on iPhone.
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I had installed WhoApp yesterday to see how I might like it, and decided to uninstall it. WhoApp uses its own VoiceMail, so when I uninstalled it and couldn't change my greeting, I was ready to blame WhoApp! Thankfully, this thread gave me the correct solution. I just deleted all of my old voicemail messages and everything works now!
Of course, this option is only available for those brave enough to hack their iPhone.
Step 7. You will be given an instruction, the rest you need to do is to follow it!
An extension is a short internal number. Extensions allow users to make and receive calls. You can assign extensions to every employee in your organization.
This solution worked for me: https://www.reddit.com/r/apple/comments/3lm2eh/difficulty_changing_voicemail_gre eting_in_ios_9/cyngnjr