This is how to make your phone ring for longer before voicemail
Im sure most of you seasoned veterans know this, but for anyone new who is suffering from Vodaphone's paltry 15 second window to answer your phone before voicemail kicks in, this might be useful.
Start -> settings -> tap on the phone button -> tap on the services tab at the bottom -> choose Call forwarding / Call divert (dependant on rom) ->Tap on the big grey "get settings" button -> wait for it to obtain your current settings from the network -> change the relevant option "forward after XX seconds"
AFAIK the max is 30 seconds, so there is no point having a ringtone that is longer than 30 secs,
Anyway I hope this helps.