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."
Do you have a landline at work? Make sure that all your phones, personal and business, have good clear, professional English voicemail greetings.

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For Android, press Settings, About Phone, and then Status. Your phone number will be listed here. Voicemail can sometimes be locked for privacy reasons but the code should be something that you created. Once you have verified your identity, you should be allowed to access to your voicemail. How do you send voice messages on android? Open up Messaging. Create a new message to a contact. Tap the paperclip icon. Tap Record audio (some devices will list this as Record voice) Tap the Record button on your voice recorder (again, this will vary) and record your message. When finished recording, tap the Stop button. How do I listen to default greeting on iPhone? On your iPhone or iPad, open the Voice app . At the top left, tap Menu. In the Voicemail section, tap Voicemail greeting. Tap Record a greeting. Tap Record . Record your greeting and then tap Stop . Choose what you want to do with the recording. How do I change my voicemail greeting to an automated greeting? On your Android device, open the Voice app . At the top left, tap Menu Settings. In the Voicemail section, tap Voicemail greeting. Next to the greeting you want to use, tap More Set as active. How do I change the voicemail greeting on my iPhone? From a Home screen, tap the Phone app . Tap Voicemail. then tap Greeting (upper-left). Tap Custom to record a greeting. Enabled when a checkmark is present. Tap Record to begin recording the custom greeting message. To listen to your recording before saving, tap Stop then Play. Tap Stop to end recording then tap Save. What should I say on my voicemail? "Hi, you've reached [your name] at [your company]. "Hi, you've reached [name] at [company]. "Hey, this is [your name]. "Hello, you've reached [your name and title]. "Hello, [Person's name] is chasing new adventures and is no longer with [Company name]. How do I hear my voicemail message?