You may need the password you created when you set up your voice mailbox. You'll only need to enter your password in the Visual Voicemail app once, during the initial setup of the service. To limit unauthorized access to your voicemail, consider locking your phone when you aren't using it.
To improve a a business voicemail greeting, keep these eight rules at the forefront of the creative process: Avoid turning customers off with overused and impersonal phrases like “your call is very important to us..." Avoid leaving customers unsure by not immediately telling them the business, department, and/or person they’ve reached. Avoid leaving customers confused with too many details and complications; just keep it simple. Avoid messages longer than 25 seconds. Do apologize for being unavailable at the moment. Do invite the caller to leave a message. Do tell the caller when they can expect a return call and actually follow through within that timeframe. Do tell the caller about any applicable alternative options of contact and information- website, live chat, email, social media, or emergency numbers. Voicemail Greetings 101

You have reached our general company mailbox. No one is available to take your call at the moment, but please leave your name, telephone number, and a brief message, and someone will return your call as soon as possible. Thank you and have a great day.
It’s a good practice for each of your team members to have their own personal business phone numbers. There are many reasons why they shouldn’t use their personal cell phone number for business, so you’ll want to give them their own phone number through your VoIP provider or phone system.