Who I have the same questioned this topic

I just upgraded from Galaxy S6 to S7.  I keep getting an error code 9009 when I try to access my voice mail app.  I have tried the following and nothing has worked:

1. Factory reset

2.  Voicemail app- force stop- clear data

3. lastly, if asked, Apps > Settings > Battery > Power Saving Mode -is currently turned off

Any help would be appreciated.