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Voicemail setup to change delay not working

ChrisIB
Level 1: Joiner
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Registered:
The delay on my phone (Realme GT) before voicemail kicks in is the default of 15 seconds.
I tried to use:
**61*901*11*30# then simply press 'call'.
to set it to 30 seconds (after disabling wifi calling) but it gives an error of:
 
Call forwarding
Connection problem or invalid MMI code (0)
 
I rang support twice and they said would do it from their end, within 48 hrs, but it is still 15 seconds. Is there any other way to do it?
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MI5
Level 94: Supreme
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Unlikely to be the phone @ChrisIB 

It's a common issue with O2 unfortunately.

If you message O2 on Facebook (https://o2uk.co/O2CFB) , Twitter (https://o2uk.co/O2CTW) or Instagram (https://o2uk.co/O2CIG) , they should be able to help you with this
Thanks

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:
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone 8+ (EE)

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Message 4 of 4
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MI5
Level 94: Supreme
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Registered:

@ChrisIB 

You said after disabling wifi calling.... did you also turn off wifi as the mmi codes need to be sent over gsm.

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:
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone 8+ (EE)
Message 2 of 4
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ChrisIB
Level 1: Joiner
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Yep, wifi was also off.

Might it be the phone? it is pretty standard though, Android 12

Message 3 of 4
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MI5
Level 94: Supreme
  • 127457 Posts
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  • 22137 Solutions
Registered:

Unlikely to be the phone @ChrisIB 

It's a common issue with O2 unfortunately.

If you message O2 on Facebook (https://o2uk.co/O2CFB) , Twitter (https://o2uk.co/O2CTW) or Instagram (https://o2uk.co/O2CIG) , they should be able to help you with this
Thanks

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:
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone 8+ (EE)
Message 4 of 4
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