2.) Sie sind mit der Mailbox von Herrn Mustermann verbunden. Bitte hinterlassen Sie eine Nachricht, damit Sie Herr Mustermann so rasch wie möglich zurückrufen kann. Vielen Dank für Ihren Anruf.
Before you push record, be sure to tell the person on the other end of the line you're recording; depending on your location, you may be breaking a law if you don't. Some US states—like New York and even the feds—only require one-party consent, which means you can record without telling the other person or persons. In California, all parties must know they're being recorded—even if the recorder is out of state. Under federal law, one-party consent is okay, but only if you're part of the conversation; otherwise that's considered eavesdropping.

You can change your voicemail password by calling (800)-331-0500 from your iPhone. You’ll reach AT&T’s automated customer service menu which will ask for your phone number and billing zip code. A few seconds later, the message “Password Incorrect – Enter Voicemail Password” will appear on the display of your iPhone. Enter the last seven digits of your cellphone number to change your voicemail password. I strongly recommend that you read AT&T’s support article on changing your voicemail password before attempting to do so.
While covering all of the relevant information, aim to keep your voicemail to about 20 seconds. You definitely should not ever record a business voicemail longer than 30 seconds, and anything less than 10 seconds will typically mean that you are either speaking too quickly or aren’t providing all of the required information.