Can't change voicemail number on Galaxy S7 edge

[walcot]

I want to change the number my Galaxy S7 edge diverts to on no answer after 30 seconds. If I type in **61*phonenumber*11*30#Send I get "Connection problem or invalid MMI code". I get the same error message if I try to check the status usung *#61#Send.

I've tried rebooting the phone but that doesn't help. I've tried using other MMI codes and I get the same message.

Anybody any ideas?

[jonsie]

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@walcot wrote:

I want to change the number my Galaxy S7 edge diverts to on no answer after 30 seconds. If I type in **61*phonenumber*11*30#Send I get "Connection problem or invalid MMI code". I get the same error message if I try to check the status usung *#61#Send.

I've tried rebooting the phone but that doesn't help. I've tried using other MMI codes and I get the same message.

Anybody any ideas?

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The phone number is the voicemail number which is 901 

[jonsie]

**61*901*11*30#

[walcot]

Thanks but I want to change it to another number (a UK landline no.) by putting my landline number instead of 901. The problem is that I keep getting the invalid MMI code message (even if I use **61*901*11*30#)

[MI5]

Have you got a network connection currently, ie. connected to o2 network?

[jonsie]

Ate you using +44 and dropping the zero on the mobile number? 

Some help here with other code. 

https://btbusiness.custhelp.com/app/answers/detail/a_id/12815/c/5193/

http://service.o2.co.uk/IQ/SRVS/CGI-BIN/WEBCGI.EXE?New,Kb=Companion,question=ref(User):str(Mobile),C...

[walcot]

Yes, I've got a strong 4G signal

[MI5]

Possibly all MMI codes have been disabled then for security purposes - the stagefright vulnerability fix turned off some of them previously.
Try setting from the call forwarding settings in the phone's setting menu.

[walcot]

Yes, I am using +44 xxxx xxxxxx without the 0, however the problem isn't the number I'm trying to divert to - the problem is that the MMI codes are invalid.

If I try anything with MMI codes such as * # 61 # SEND or * # 21 # SEND to check the status I always get the same message "Connection problem or invalid MMI code". It's not a connection issue as I have a good signal & everything else on my phone works OK so it must be a problem with the MMI codes

[jonsie]

Stab in the dark.... are you on monthly contract as payandgo isn't supported?