> the frequency of a phone and the frequency of phones is quite similar
(I'm assuming you meant frequency of a phone and microwave oven.) That's not quite accurate. Cell phones use many frequency bands [1]. I only see one frequency on the list (2500 MHz) that is close to the frequency used by consumer microwave ovens (2.45 GHz) [2]. I don't think 2100 MHz is close enough to be attenuated by a microwave oven, but of course I'm just speculating because it depends on the design of the oven's shielding.
Don't forget that phones switch to a frequency on which they have signal. If you don't have 4G coverage, your phone will use 3G, etc. These operate at different frequencies. So attenuating one or two of the frequencies on the list is probably not good enough.
> I don't think 2100 MHz is close enough to be attenuated by a microwave oven, but of course I'm just speculating because it depends on the design of the oven's shielding.
I assumed that the design was that of a Faraday cage, which blocks the frequency it's designed for and all lower frequencies. anotherhue noted however that it's a tuned RF choke, which will only block a certain frequency.
For reference, I'm in Australia with a 3G phone on Optus, so the frequencies here are a little less scattered [1].
(I'm assuming you meant frequency of a phone and microwave oven.) That's not quite accurate. Cell phones use many frequency bands [1]. I only see one frequency on the list (2500 MHz) that is close to the frequency used by consumer microwave ovens (2.45 GHz) [2]. I don't think 2100 MHz is close enough to be attenuated by a microwave oven, but of course I'm just speculating because it depends on the design of the oven's shielding.
Don't forget that phones switch to a frequency on which they have signal. If you don't have 4G coverage, your phone will use 3G, etc. These operate at different frequencies. So attenuating one or two of the frequencies on the list is probably not good enough.
[1] https://en.wikipedia.org/wiki/Cellular_frequencies
[2] https://en.wikipedia.org/wiki/Microwave_oven#Principles