Once connected to a another phone via bluetooth you can call many functions.
- 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.
Notes:
1.) When connecting devices use a code 0000
2.) At start of programm on smartphones do not forget to turn on bluetooth before start of the application.