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Considering how much trouble microwave ovens have given me with wifi in the past, I would not place much confidence with them.

Less soundproofing.

How about putting phones inside the microwave and then putting microwave inside the fridge?

I favor putting the phone in the martini shaker, and the shaker inside the dishwasher while washing a big load of clanky dishes.

Good question. The mesh size of the Faraday cage should be less than 1/2 the wave length of the RF radiation. At 2.4 GHz, the wavelength is ~125mm, and the mesh size of your typical microwave is a few mm. With the lower frequency of the cellular bands, you'd expect the microwave to work pretty well.

There's also the gap around the door, which is often poorly fitting on older worn-out units.

Still, the phone could be recording audio to upload at a later time. Audio storage capacity isn't likely to be a problem on modern phones.

http://xkcd.com/654/