IMA 流動資訊站

I'm new user, have some questions, thanks for your help first. I'm using "smartone":

1. why I do not answer the phone, it will switch to the phone's "Answer Call" (like an answer machine)? when I press Busy when a call comes in, it will switch to "smartone" voice mailbox?

2. there is a choice "on/off" for the "Answer call". but the result seems to be the same.

3.when I press "No" when a call comes in, it will not switch to "answer call" or "smartone" voice mailbox either?

thanks