Yeah, you can’t do what you’re asking. Voicemail configurations are limited and flaky at best.

I used to be able to do exactly that, welsh paul

I could pick the delay before calls went to answer machine.

I chose 15 seconds,
and It would divert to answer after 15 seconds.

Maybe the problem is “123”  has lost it’s attachment to “+44778233123” on my sim

As my original post above, it DOES accept the time delay. !

-→ 
***so, it accepts the 10 second wait, before trying to transfer the caller to 123
<---

eg
*61*123**15# will wait 15 seconds before the “cannot connect” message
*61*123**5# will wait 5 seconds before the “cannot connect” message

It only reverts to an unchangeable and a system 30 seconds wait
when the full +447782333211 is entered via *61* rather than the 123 via *61*

eg
*61*+447782333123**15# will ignore the 15 seconds specified and divert after 30 seconds
*61*+447782333123**5# will ignore the 5 seconds specified and divert after 30 seconds

Anyone from idmoibile ...
Is there a way that idmobile can link 123 back to +447782333123 at their end
-→ as it used to work , and the time COULD be set any figure from 5 seconds to 30 seconds , in increments of 5 seconds

I’ll repeat . It used to work, when using 123 eg *61*123**15# , it would set delay to 15 seconds

Cheers 
Liam

**Update … thought I’d fixed it by swapping to an eSim , but it didn’t ***

A few years ago I read on the Three community forum that they’d made some changes to voicemail. As a result, many short codes either don’t work at all or only work for some people. 

Thank welshpaul

what I am trying, at, ( but I don’t have a spare phone)
is...
turn off call waiting
#43#
then set the *61* to divert back to my mobile number ,
in the hope that it will trigger the *67* busy and divert to answering machine.

ie *61*(my mobile)**10#

with a status check of *#61* it shows that my mobile will call itself, after 10 seconds if unanswered
(ps ALL other mobile numbers EXCEPT  07782333123 will accept the time to be set)

I’ll probably find out tomorrow when I ask someone to ring me.
All the best
Liam

nope, didn’t work

unfortunately this is a deal breaker for me, so I’ll be terminating my contract and moving on

Cheers
Liam