This usually happens in a area where there is no service. If the network cannot find the phone, it will go to the voicemail. If you are in an area oor building and there is no service and try to make a call, you will get the message, call failed.
Hope this helps.
My wife has the v3 but if she trys to make a call it says call failed, and if I try to phone her it goes straight to answer service.
can anyone help