3. Place your mobile phone inside the microwave and shut the door.
4. Using another mobile phone, dial the phone that's inside the microwave.
5.
If the outside phone says "the number you are dialing is not
reachable, or is out
of coverage area, or is switched off; then your
microwave is safe.
6. But if the phone inside the microwave lights up and rings, your microwave is leaking radiation.
If shortwave could get in, there is no reason why it could no get out when door is shut.
Just
throw away the damn thing and get a new one. (Believe me, the medical
treatment of the side-effects of radiation leaks is costlier than the
price of maybe 10 new microwaves.) Remember, just because the door of
your microwave appears to shut properly does not conclusively mean that
it is not leaking radiation. Stay safe, and test your microwave
regularly
at frequent intervals; the frequency of testing depending on
the extent of usage, and you are the best judge of that