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Connection problem or invalid MMI code

Help11
Level 1: Joiner
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Hi
I have an unlocked Samsung S7 Edge with an O2 pay monthly SIM card.
My answer phone kicks in too early so I am trying to lengthen it by typing **61*901*11*30# but keep getting connection problem or invalid MMI code.
I have restarting, starting in safe mode, checking network, and all the other advice but nothing works.
Can anyone help?
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MI5
Level 94: Supreme
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@Help11 

This is because wifi calling is enabled.

You need to ask customer service to disable it so you can change your ringtime then you can get wifi calling enabled again if you wish.

I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.

Currently using:
Pixel 7a (O2 & Lyca), One Plus 6 (Sfr), iPhone 12 Pro Max (Vodafone)
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