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:
My personal greeting has been set for my MetroPCS phone but I peope can`t leave me a voicemail?
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2. Access your voicemail. Dial *98 from your home phone. If you are away from home, dial your access number and follow the prompts, or dial your phone number, then press the * key when you hear the greeting.
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Dial your mobile, wait for it to go to answer phone and hit the star key, a prompt will ask you to enter your pin code that you set up previously, followed by the hash (#) key. So if you have no credit to access voicemail to set up a pin your kinda stumped.
When voicemail is not working on your iPhone, a lot of people assume that there’s a problem with their wireless carrier, so they immediately call Verizon, AT&T, T-Mobile, or another carrier’s customer support hotline. However, a lot of the time the problem is really caused by a software issue on the iPhone itself. Your iPhone isn’t downloading voicemails from your wireless carrier; or The Phone app on your iPhone isn’t working correctly
3. Tap the "Voicemail" button in the bottom-right corner of the screen to enter voicemail.
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3. Click on your phone, then “Scan,” if you’re prompted to confirm what type of data to scan select “Voicemails.”
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
Your voicemail service is usually controlled by your mobile carrier, therefore, the most reliable way to turn off your voicemail is to ask their support team to disable it:
Solution 1: Disable Wi-Fi and Use Cellular Data While Changing Voicemail Greeting
Sometimes, giving your iPhone a fresh start by turning it off and back on again can resolve a minor software issue. For instance, if the software of your iPhone crashed in the background, it may have caused the Phone app to malfunction.
Launch Settings from the home screen of your iPhone, and then tap on Phone option. And then you can change the new voicemail password now.
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?
Website: https://forums.att.com/conversations/apple/iphone-8-and-voicemail-custom-greeting-not-working/5df01bbfbad5f2f606f690fd
Vivio help you to stay connected with this O2 Voicemail set-up guide on an Android OS Galaxy handset