If you'd rather save your voicemail as a file in one of your iPhone's folders, do the following after opening the "Share" menu: Tap Save to Files. Tap On My iPhone if it isn't already expanded. Select a folder. Tap Add in the top-right corner of the screen. Listen to …
With Apple Visual Voicemail, the red circle on the phone icon on the main menu changes to an indication of how many new voicemail messages you have received and how many calls you have missed.

Techjunkie.com One sign that your phone calls are being ignored is how many rings before it goes to voicemail. Generally, the feedback ringtone will go through several cycles before the voicemail message comes up. If upon placing the phone call, it rings only once or twice and goes to voicemail then your calls are probably being declined. 443 is also the number to dial to retrieve voicemails. To switch voicemail off dial 1626. Voicemail deducts one minute from your Goodybag regardless of length of call (assuming you have minutes left) or, if not, costs 8p per call.
From the My Phone Service page, scroll to My voicemail and select Set up voicemail. Choose your voicemail box type. Select Advanced voicemail (suggested method), and then select Next. Subaccounts voicemail access and phone number assignment. Add name and assign each phone number a name to easily identify who is using the line. Select Continue.