With Call Guard you can block incoming calls/sms (text messages) or outgoing calls.
Now with Full Pick up/Hang up mode(no voicemail,no notifications) support for all versions, (2.3 Gingerbread included)!The only app on the market which leaves no traces of the call, even on Gingerbread

Alarm Sensor warns you against a range of threats. You are aware of danger at the moment of setting the desired sensor. Specified by the user warnings is automatically activated in case of dangers.

1. Notifies about miss call, received call, dialed call and incoming messages, outgoing messages, SIM change through email or sms.
2. You can change the settings remotely through any mobile by sending text messages(commands).
3. Filter to get the notification about specific phone number only.

Note: Some features are only available for pro version