Unable to set up Visual Voicemail on 2nd phone number
I have had Visual Voicemail working on my primary phone
Samsung SM-G900A, Android version 6.0.1, security patch level April 1, 2017
, (and 3 prior models) for years with no issues. It is working right now and I need to keep it working without interruption.
However, I have never successfully been able to set up Visual Voicemail to retrieve messages on my second phone,
Samsung Galaxy A12, Model SM-A125U,One UI Core version 4.1, Android version 12, Kernel version 4.19.188-25461540-abA125USQU5CWB3 #1 Wed Feb 15 01:04:50 KST 2023, Security enhancements status Enforcng SEFP_SM_A125U_12_0001 Wed Feb 15 01:17:26 2023
after the device was replaced when AT&T shut off 3G infrastructure a little over a year ago. Furthermore I have never successfully been able to manually access the voicemail on that device since I got it.
A lot of googling hints that the default passcode is the last 6 digits of my account number. Note my account number is the same for both devices, although of course the phone number is not.
However, this default code simply does. not. work.
I also have been unable to read the passcode set into Visual Voicemail of my first device for confirmation. Some google hits refer to a menu tree that does not match my device even closely, and reference selections that are nonexistent on my version. Is there some Galaxy S5 specific documentation on Visual Voicemail someone can link to?
I stumbled on one article that said they broke Visual Voicemail with an update requiring a minimum of 7 digits for a passcode, with later OS and phone versions. Beyond that, I see enough confusing and contradictory info on resetting the voicemail passcode, to just go whoa, get the experts on board before proceeding further. An unstated implication appears to be that the same passcode applies to the voice mail for all lines for the account, although I have not found this explicitly stated anywhere in my research so far.
I need some clarification (and possibly hand-holding) on exactly what procedure to follow to 1) finally retrieve almost 2 years of voicemails in the 2nd line, and 2) not break the voice mail on my first line.
There are over a years' worth of accumulated un-heard voice mails associated with that second line that I badly need to retrieve, some of which I also need to export to offline backups, so preservation of these messages and those on the other line are critical.
Partly related - I used to be able to save voice mail messages from Visual Voicemail on the Galaxy S5. I found several backed up to another machine. However, an update some time in the past broke this ability, took away a menu function or something, and so now I have to resort to share via email to export them off of the phone. That is the next project after getting the A12 2nd phone's voice mail working at all.