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Unable to extend time to voicemail, MMI failure.

PeterC3
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I am utterly fed up with customer support, I have been talking to them for two weeks trying to extend the delay to voicemail to 30 seconds. At their request I have entered all sorts of MMI codes all of which go through except **61*901*11*30# which generates 'Connection problem or invalid MMI code'.  I have now been told there is nothing they can do and I should contact Samsung support.  Samsung push you through to 'Just Answer' whose technical adviser promptly told me to use the same code !  When I got the failure again his only suggestion was to try changing my ring tone or to turn off voicemail.  I have tried turning off wifi etc but it does no good.  Is there anyone in tech support who can help please.

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TNJGB
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So after getting the 4G & WiFi ceased I was able to put in the code to get the 30 seconds ring delay before transferring to voicemail. When I checked that it was set it came up with confirming only for voice calls (which fine) , normally it confirms for many other types of call including Voice, Data, Fax, SMS, Sync, Async, Packet & PAD.

 

I then had the 4G & WiFi reinstated and then noticed that my diversions on busy and not available had been cancelled so I individually set these up again. However this also reverted the divert on no reply to 15 seconds, even though I did not try to change this. I could not change this back to 30 seconds as I got the original MMI error message again. So I had to ask O2 to cease the 4G & WiFi again so that I can enter the 30 seconds code and then re-enter the no reply and not available options which are now all working. I will now need to ask O2 to restore the 4G & WiFi again.

 

It is going to be a nuisance if I have to ask O2 to cease and reinstate 4G & WiFi every time I need to change a diversion setting. It seems I should be able to do this on MyO2 but this facility is not available and I have to ask technical support.

 

The same issue exists on BT Mobile except they don't seem to accept that the issue exists but their default is 20 seconds which is just about useable.

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