Hi, girolez is quite right, it is a network setting, not a phone setting. However most carriers allow the phone user to change it by keying in an MMI code but as is so often the case different carriers have different access numbers.
For Orange (UK) it is **61*07973100123*11*xx# (*61*07973100123*11*xx# also works)
where xx is time in seconds, 05 up to 30 in 5 second steps. I have changed mine so I know it works.
If you Google search :-
"Changing number of rings before voicemail on xxxxxx"
where xxxxxx is your carrier, you should get the appropriate info.
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