Is the mobile phone test for microwave radiation effective?

I have a microwave oven that is only a few months old. It has never seemed 'right'. A little while ago I noticed that when it was heating food the light from inside the microwave also slightly came out of the oven. I have just done the mobile phone test - ring phone inside oven and it rang, no problem. I did this to my really old oven - maybe 10 years old or more - and nothing happened. Is my new microwave oven harmful?? Should I get rid of it?|||that could mean that the shielding of the microwave is bad i would take it in and get it looked at microwaves cannot hurt u (non-ionizing) but it could possibly damage other things get it looked at