Voice Mail on Cell Phones

I have a Verizon phone. It’s an iPhone. I don’t think it much matters about the brand though. A few years ago the phone app started a transcription where it offers to play the voicemail and it transcribes it to text. I do like that feature. It does not change the status of the voicemail being on Verizon’s server, however. My voicemail box resides on Verizon’s servers. I can play messages that have downloaded to my phone, but they still remain with Verizon, even if I delete it from my phone.
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In order to listen to my voicemail on Verizon, I have to call my voicemail box, either using *86, or calling my phone# and interrupting the greeting. I use *86 because I have for a decade, I then go through and listen to the messages. I can save a message, by pressing 9, or delete the message, by pressing 7. I have a lot of saved messages from family, because they are especially cute. Yes, I am a dork.
 
You don’t have to listen to the whole message to save or delete it, just press the 7 or 9 once it comes on.
 
AT&T also uses the 7 & 9 for save-delete, as does T-Mobile. Below I have the 3 major companies listed with a link to read about how to setup, listen, save/delete your voicemail. That way when I call you, I won’t get a 'mailbox is full' message.
 
Verizon - https://www.verizon.com/support/voice-mail-faqs/
 
AT&T - Access Voicemail - AT&T Wireless Customer Support (att.com)
 
T-Mobile – https://www.t-mobile.com/support/plans-features/voicemail
The T-Mobile page is good except it fails to mention that a 7 will delete a message.
 
Here’s a link that explains how to setup your voicemail on the 3 major carriers, if you haven’t already. https://www.androidpolice.com/how-to-set-up-your-voicemail-on-every-major-us-carrier/