When Acallno.A is installed the installation package will create following files to the device C: drive:
Hiding from the User
When Acallno.A is activated, it will remove its uninstallation information from the install logs and hide its process from application process list.
Also, Acallno.A does not have any kind of user interface or uninstallation option, so only way to detect its presence is to use antivirus or a third party file manager that shows the contents of System\apps directory.
Sending SMS Messages
Acallno.A monitors the users incoming and outgoing SMS traffic, and as soon as the user sends or receives an SMS message, Acallno.A will forward this to the number that is configured in the software licence.
To prevent the user from noticing the extra messages, Acallno.A will remove the message from the sent SMS messages list.