Call divert deactivation does not work .

[Graham112]

I use code ##21# and get a message "Call forwarding Connection Problem or invalid MMI code (801)

[gmarkj]

The codes don't work if you have WiFi calling enabled on your phone @Graham112 .

Try turning it off, reboot your phone and then send the code again.

[Graham112]

The Samsung Galaxy A52 5 G phone came with the Wi-Fi Calling in Settings already switched off. O2 advisors varied a great deal in their knowledge of the problem. One however has told me O2 will deactivate the Call Forwarding in the next 24 hours for me. I await with in hope and will update.

[Graham112]

O2 have now taken the Call Divert Off and the phone now accepts calls again without diverting but the divert symbol on the phone is still there. So I will not play about with it and accept that the phone is working normally but without the ability to divert calls to voicemail.