I used one for a few years, but you need to go into airplane mode and not forget, or your battery drains VERY FAST from it searching for antennaes. You also need to turn off wifi (various bands) and turn off bluetooth (2.45GHz band) or your faraday mesh will eat up your battery.

MOS Equipment "Mission Darkness" MDFB-S-NW 4 ounce model from Amazon is "good enough" , but does not block microphones, and costs only 23 dollars :

23 dollars :
https://www.ama<<REMOVE THIS>>zon.com/Mission-Darkness-Non-Window-Faraday-Phones/dp/B01A7MACL2/

You also need to roll it into a little acoustic BALLISTICS foam if you do not have a portable piezo (non digital) white nose generator adjacent to a iphone.

iphones have 4 (yes 4) hidden microphones in them, four. four fucking hidden mics one is siri dedicated, two are system stereo human voice isolating to cleverly earse background noise, the 4th is a secret nsa/apple mystery mic.

countless ultrasonic and sonic sound proof foam sheets exist to wrap your phone in if it is on your body or glove box :

http://www.ballistic-online.com/

https://www.spartech.com/products/custom-sheet-rollstock/flexible-sheet/soundx-flexible-acoustic-barrier

I use neither of those brands but they would work.

I use far more expensive stuff meant for usage for mil-spec.

AIRPLANE MODE fake on iPhone in spy OS from apple : iOS 11.1 from apple SECRETLY TURNS ON WIFI AND USES WIFI when in AIRPLANE MODE!

Refer to this alarmed post :

https://discussions.apple.com/thread/8146282

Apple engineers stated in that apple.com post that the antennae are all periodically enabled ON PURPOSE against your will, when you try to turn off antennas using Airplane mode.

so on iphone/android you need to manually turn off bluetooth and also manually turn off wifi and third ... manually turn off cell antennaes. they love to spy.

Fun fact I proved : airplane mode does not create a true OS state unless in airplane mode for over 60 seconds, but that is not the link I shared above.

ALL PHONES SPY ON YOUR NEARBY VOICE CONVERSATIONS (FBI interested people)

all phones , android and apple, convert voice to text and then send a buffer of last 2 hours of whispered text in vacinity of phone upstream as text once airplane mode is flipped off and cell back up. ALL PHONES do this and is easy to prove using ampmeters attached to battery packs. They do not do this at all if battery level drops to 21 to 22% though. They only seem to do it guaranteed if phone being jostled and walking or driving around prior to lying still. humans conversing (a exotic live cable tv news channel also works for testing). prerecorded might be whitelisted (technically blacklisted). the big arbitron radio markets and big tv channels might be also be ignore by cell devices , but NOT possible if in airplane mode and then the battery drain is astouding to watch using older android and older iphones. 25% of battery drained PER HOUR if converting your spied on conversations to text for later upload.

NOISE GENERATORS!

you can avoid acoustic foam if merely trying to make white noise one inch from your resting phone :

If at home, and phone connected to cell or wifi for incoming calls, you can add a random noise ANALOG circuit full spectrum white nose generator and you can modify circuits to cut off ultrasonic above 28Khz to not make your cat/hamster/dog hate entering your kitchens.

hundreds of designs, avoid digital storage 8 dollar loops from amazon. demand 100% analog style, no DAC from prerecorded loops.

http://www.discovercircuits.com/N/noisegen.htm

hundreds of designs to stop spooks from listening to people in your kitchen if your LG dishwasher mic, your LG washing machine mic not nearby, or your microphone internet refrigerator not connected to wifi password of you or neighbors house, (they use zigbee path to your AC power meter though for NSA level taps). Your tvs all have mics and use your roku or firesticks to hop ride onto internet.

If you have alexa or siri in your house , you are just a fucktard and can ignore this entire post