Once connected to a another phone via bluetooth you can:
- read his messages
- read his contacts
- change profile
- play his ringtone even if phone is on silent
- play his songs(in his phone)
- restart the phone
- switch off the phone
- restore factory settings
- change ringing volume
- And here comes the best
“Call from his phone” it includes all call functions like hold etc.

Super Bluetooth Hack for S60 2nd-3rd devices.
Works very well on sony ericsson/samsung ans Nokia phones