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?

[MI5]

Try adding a comma to the end of the code, ie. *#61#, send

[walcot]

yes I have an O2 business monthly contract.

[walcot]

No, sorry, same problem.

Incidentally, with all the codes I've tried, when I press send I initially get a message "MMI code started" but then the error message

[MI5]

Codes must be disabled in the firmware.
Did you try from the phone's settings menu?

[madasaf1sh]

Have you done a ##61# to degregister the current services

Then do a full status check on *#61#

Then reissue the command *61*+441142xxxxxx#

I have tested this with my 2 android handsets and my iphone and diverted calls to my BT Mobile and SfB landline successfully using the MMI/USSD codes.

Also reboot your handset.

[walcot]

I can't find anything in the settings menu about enabling/disabling MMI codes

[walcot]

Tried all of those & still get '.....invalid MMI code' every time including ##61#. Have rebooted several times to no avail

[MI5]

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@walcot wrote:

I can't find anything in the settings menu about enabling/disabling MMI codes

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No, I mean call forwarding settings.

[walcot]

Going out now but will check tomorrow & report back. Thanks to all for suggestions!

[jonsie]

Try ##002# and see what message you get.