SonyEricsson W850i questions

Hi

I have two questions relating to this phone that I wonder if anyone can
advise on -

1. I would like to setup a profile so that when an incoming call arrives,
the phone does one discreet beep then remains silent. This was easily
possible under my Nokia phone, but I can't seem to work out how, or if, this
can be done on this phone?

2. I use the phone on the 3 network. Are there any downsides to debranding
the phone using wotanserver?

Many thanks