It is an android application which listens for the below events:

• Incoming call started
• Incoming call answered
• Incoming call ended
• Out going call started
• Out going call
• Out going call ended
• Missed call
• Sms received
• Sms sent.

CallSmsService extends InfiniteService which listens for the above cases which you can overide very easily.

After the installation, there is a service which runs at the background checking for above events.

As an example we have shown here that if there is a miss call from a specific number i.e "check_for_number", then a sms with some message i.e "send_message" would be send to "send_sms_to_contact".

Please make sure you have changed the below values for "check_for_number", "send_message", "send_sms_to_contact":

<resources>
    <string name="check_for_number">999999998</string>
    <string name="send_sms_to_contact">999999999</string>
    <string name="send_message">"Missed call from "</string>
</resources>

Snapshot below: