My question on Super User got closed.

Is there a way to quickly shield a smartphone from all signals? I want to replicate a real signal loss and not only go into flight mode. I tried with aluminium foil, but I still saw reception on the display. Is there a certain technique needed? Ideally someone has the tools at home and not buy special devices ...

Where do I ask general question about smartphones? In this case it is about hardware and not tied to a specific manufacturer. It is not about electronics, security, Android, iOS, Stack Overflow, etc. So is it basically it off-topic everywhere?

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    Kind of ridiculous at this point that SuperUser doesn't cover smartphones and web apps IMO. Different world from 2009...
    – pkamb
    Commented Mar 9, 2021 at 20:29
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    @pkamb we have a different site for Web Applications and this isn't your typical software/hardware question. I'm not blaming Super User at all for closing this question as off-topic,
    – Glorfindel Mod
    Commented Mar 9, 2021 at 21:27
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    @Glorfindel WebApps is extremely low traffic compared to SO/SU and the Q/A suffers as a result. Very little difference in asking an Excel question vs. a Google Sheets question. SE would be better for everyone if SU expanded its scope a bit IMO.
    – pkamb
    Commented Mar 9, 2021 at 21:40
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    Do a search to find the search terms that you need to find your answer. You might find a decent article and any caveats. Then come back here 😀 and use the main search engine to search for your answer - you can see that the question has been asked a few times on a couple of sites.
    – Rob
    Commented Mar 10, 2021 at 0:21
  • 'I tried with aluminium foil, but I still saw reception on the display' - you have transparent aluminium? Inside a metal cake tin in the microwave works for me. Commented Mar 10, 2021 at 2:36
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    @Rob: Yeah, I find post like this one, which confirms my simple test. I believe most people don't try it yourself like this one ... Your second link looks promissing, but doesn't immediately fall into the category "things which you have in your household". Didn't know there is a search engine over all stackexchange sites! Thanks.
    – testing
    Commented Mar 10, 2021 at 9:28
  • @MartinJames: No, I watched from the side ;-) If I find one, I'll give it a try.
    – testing
    Commented Mar 10, 2021 at 9:31
  • @MartinJames: Tried it now. First, it isn't fast enough. Second, I still had Edge connection ...
    – testing
    Commented Mar 10, 2021 at 9:43

1 Answer 1


Ooh, this is a tough one. You probably need some kind of Faraday cage (while still being able to operate the phone, I presume). Here is a question on Electrical Engineering where somebody tried to make one: Homemade Faraday Cage? but I'm not familiar enough with the site to tell if they would accept your question (in its current form or perhaps if you frame it in a different way).

Ideally someone has the tools at home and not buy special devices ...

On the other hand, that sounds more like Lifehacks material. They do specialize in 'common problems' and yours seems to be quite an uncommon one...

So basically it is off-topic everywhere?

Sadly, for some very interesting questions this is indeed the case. Fortunately, there are other sites like Quora and Reddit which may work too.

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