I've read that many shuls have "cell phone lockers" to encourage people who come for praying to store their phones prior to entering the shul.

It's a great idea, but, many shuls don't have this, or don't want to spend money doing this. Regardless, it's nearly impossible to force everyone to turn off their phones or place it in a locker. As an alternative, I'm curious if anyone has invented a complete cell service "blocker" which will block out all web as well as phone service from both inbound and outbound calls, as well as all texts, WhatsApp, etc. It won't completely discourage people from using their cell phones, but, at least, if they can't have their phone's ring, it will be less noisy, and it may ultimately discourage such people from using the phones altogether while praying.

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    One of the moral dilemmas from achim.org was about a shul that did this and a doctor who was unhappy because he couldn't go there anymore.
    – Heshy
    Commented Oct 17, 2018 at 21:25
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    This is definitely more expensive than a designated locker.
    – Double AA
    Commented Oct 17, 2018 at 21:31
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    I'm voting to close this question because it is "irrelevant" based on judaism.stackexchange.com/q/9881/5275
    – DanF
    Commented Oct 17, 2018 at 22:03
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    I have to admit - this is probably the strangest incident I've had on this site. I vote to close my own question, and I can't even do that. And I can't delete it, because @DonielF has 3 votes so far. I don't get it, but, I'm fine with not understanding the policy, here. If a mod wants to explain it, fine. Doesn't matter to me either way.
    – DanF
    Commented Oct 25, 2018 at 2:34
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    @DanF Others may disagree, and you might still be able to close it. That’s just my personal opinion.
    – DonielF
    Commented Oct 25, 2018 at 11:26

1 Answer 1


Whether someone’s done this or not, I’m not sure, but I know the question was posed to Rav Zilberstein (don’t have the source on hand) of a hatzalah agent who missed a call because of this and as a result someone died. That’s probably why you don’t see this very often.

Anyway, the technology exists. It’s the same technology that keeps you from getting toasted whenever you turn your microwave on, or to keep a thief from using an RFID reader to steal your credit card information: a Faraday cage.

The way it works is that particles in the cage are designed as to distribute the charge evenly and equally across the cage, rather than allow it to pass through. This needs to be calibrated fairly precisely: the microwave doors are calibrated to trap microwaves inside, but you can call a phone you’ve left in there, and you can see the light produced from the bulb inside; an RFID bag may or may not allow visible light through, but the important part is that it blocks radio waves.

LTE frequencies range from 450 to 5925 MHz, so you may need two or three layered cages to cover the entire spectrum (and possibly watch for quantum effects). But, once again, use with caution in case of emergency.

  • Thanks for the quick answer. I've requested that this question be closed. See my comments and the linked question.
    – DanF
    Commented Oct 17, 2018 at 22:06

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