The length of fime before a call goes to answerphone is controlled by your network and has 30 seconds as the maximum, if you enter *#61*11# and then the call button it should tell you what yours is set to, it might just tell you that its enabled without the length of time. To change it you need **61*destination*11*nn#[SEND] where 'destination' is your voicemail number, 11 is to say that it is voice calls you're dealing with and nn is the number of seconds (30 max) and [SEND] is using the call key at the end