voicemail

[Micro123]

I have never used voice mail but of late I am getting numerous voice mail alerts. Using my mobile I went in and changed password, I did not know I had. I gave a 5 digit password. No comment back to say it was not satisfactory. However on using to get to voicemail I an told not recognised.

[pgn]

Guide here should help, @Micro123 - Guide: All you need to know about O2 Voicemail 901 

You may need to disable 4G Calling or WiFi calling temporarily if enabled for some of the #codes to work, but the Switch-On and Switch-Off should work. Also call you phone from another number and leave a message to see if that clears the indicator that is probably stuck. Good luck.