[KavanderShadow]

This is one area I consider myself decently proficient on the subject. I am an RF technician, and I have worked on many projects for (yes I know.. I quit my job after realizing what I was doing and to what end) DARPA, NASA and other alphabet agencies. I can't go into specifics on some questions about most projects you may want answers to...I have signed contracts and don't want to be :cough: silenced. I don't trust my ISP.

CW: Continuous Wave
HE: High Energy
Anyway,
The microwave ovens faraday cage is tuned for CW between 2.39gHz and 2.45gHz

Cell phones on a CDMA or GSM network are HE pulsed between 850mHz and 1900mHz 

This means that most microwaves will not block the signal. 

However, WIFI on the A/B/G bands (2.35-2.47gHz) will be blocked by 99% of ovens. 
Wireless-N band (4.9-5.1gHz) will not be blocked at all. 

I suggest if you decide to test it out, use a phone & network that is not dual band wifi capable. Look at the wifi signal strength with the screen on, preferably while on an "older" network router and streaming data.

Even better is using a Bluetooth speaker on the outside, and the phone on the inside streaming something and close the door. BT transmits at 2.485gHz and should be blocked by the microwave. 

I hope this clarifies some things. 

Ps: my apartments microwave is terrible, and is very bad at blocking anything. BT, WiFi and cell signal comes in strong on the phone in the damn thing. We don't use it now.