Adverse possession is not a property interest
You seem to have the idea of adverse possession backwards. If you adversely possess my property then I have a cause of action against you - you don't have a cause against me. You can become the owner if I fail to take such action within the required time. If that happens you can apply to become the owner - my ...
It is Illegal
Specifically, it is in breach of s7 of the TELECOMMUNICATIONS (INTERCEPTION AND ACCESS) ACT 1979:
(1) A person shall not:
(b) authorize, suffer or permit another person to intercept; or
(c) do any act or thing that will enable him or her or another person to intercept;
a communication passing over a ...