However, some cellular service providers allow users to access and update their voicemail by calling their own numbers from working landlines or phones on other wireless networks, so users whose accounts include such an option and who have access to alternative service could keep the voicemail greetings updated even when their own mobile phones cannot connect to cellular or internet service.
To change your Home phone voicemail message playback preferences, head to the main menu and select 4 > 4 > 2. Then you may: Select 1 to change the order in which your messages are played (most recent first or oldest first); Select 2 to hear the calling number before every message; Select 3 to hear the date and time before every message; Select 4 to hear the number that was called before every

Retrieving voicemail messages. Users can listen to voicemail messages by accessing Nextiva Voice mailbox from a Nextiva phone or external phone. If calling from the primary phone, dial *86, otherwise if calling from any external phone, dial the phone number and press the * key during the voicemail greeting.
Verizon only: Unfortunately, if you have set up the voicemail successfully but still unable to change the greetings of Voicemail from the Voicemail tab, then dial *86 and select option 4 to make a change. Step #1: Launch the “Phone” app on your iPhone. Step #2: Tap “Voicemail”. Step #3: Select “Greeting” on the upper-left corner of the screen. Step #4: In case, you are also using eSIM then select the second network to change voicemail greetings. Step #5: Select “Custom”. From here you can record a greeting. Step #6: Tap “Record”.