15. Hello, you’ve called [X Business Name]. We are currently closed. Our opening hours are [State opening hours]. Please visit our company website at [company website URL], or email us at [X email address]. If you’d like a callback, please leave your name and phone number, and our team will get in touch with you within 24 hours.
Many people don’t even know about this PIN option, so they never get around to changing it to something a bit more secure. That’s how the whole News Of The World hacking scandal came about, so you should always remember to create a new PIN for your voicemail that will be harder to guess. And if you’re even remotely famous it’s probably worth changing it every few months as well.

On the iPhone, go into voicemail and tap "Greeting". Record a few seconds of something and tap stop. Before you tap save, use iFuntastic or SFTP to navigate to /var/root/Library/Voicemail on your iPhone. You'll see a file called "Greeting. amr". This is the audio you just recorded. Delete that file and replace it with your custom message which should then be renamed to "Greeting.amr". Tap "Play" on the iPhone to verify your message works. If it plays, tap "Save" and your custom message will be uploaded to AT&T's servers.
You can ask your admin to change the greeting language for everyone in your organization. Your admin should see this topic for instructions: Change the default language for greetings and emails.