To set up voice mail, tap the Phone icon, tap the Voicemail icon and then "Greeting.". There are two options available: Default and Custom. If voice mail hasn't been set up previously on your phone, Default is selected, which means people will hear your wireless carrier's generic voice mail greeting when they call you.
Optimum is the first landline telephone service provider in the U.S. to launch High Definition calling. HD calling is the next generation of voice technology that gives you less background noise, sharper sound quality and increased clarity in your phone conversations. To experience HD calling, customers and call recipients must subscribe to Optimum Voice and use HD-capable handsets.

It can be overwhelming to someone calling if your voicemail suggests they leave their name, address, time of calling, reason why calling, best phone number to call them back at, etc. They might not be prepared with all of the information and could end up leaving a confusing and flustered message. Instead, just kindly ask the person to leave their name and number and reassure that someone will be in touch as soon as possible.
In the Calling User Portal, you can manage your voicemail settings, like when you want your voicemail to be active, message storage settings, and how you would like to be notified of new voicemail messages. You can also set up your voicemail greetings. Choose When to Send Callers to Voicemail Choose Where to Store Your Voicemail and Fax Messages Enable Voicemail Notifications Allow Callers to Transfer From Your Voicemail Greeting Set Up Your Voicemail Greetings Choose When to Send Callers to Voicemail