Yes it worked on cutting of the phone signal, idk and didnt research for better tests, do you recommend any specific?
Discussion
Try to use the "find my phone" app on your computer to see if it can ping a location or force it to ring.
I've also seen this but I don't know much about it,
https://mosequipment.com/pages/mission-darkness-faraday-bag-testing-app
Tks man