In my case, it doesn't work:
1) Phone doesn't reconnect to network, no calls possible until after restart
I have used pre-rooted image (GT-I8190N-BTU-I8190NXXALL6) from xda developers. Installed rsap trial (which worked on first try) and then full version. However, I had to find out it only works on the first connection.
2) Phone also doesn't reconnect to car phone.
When trying to reconnect to car automatically, the phone appears to be in rsap-mode (small sim-icon in upper left corner), but car phone does not establish the connection. After a long wait, it falls back to HFP, which is useless because of (1) above
How can this be fixed?