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I could not imagine cell phone jammers would be מותר, but perhaps my gut-feeling is wrong...

Either way, I would be interested in knowing how they fit into halacha, and what the reasons behind forbidding [or permitting] their use would be. I would expect an answer to both cover the angle of how it affects an innocent user of a cellphone walking by, as well as the effect on the phone companies themselves.

Also of importance: would the location of the jammer (ie. whether in public or private domain) have an effect on the halacha?

I am specifically asking with regards to Jewish law, and without considering that they are in fact illegal by secular law (at least in the US).

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All these details.... It sounds like a full answer to this would be both long enough and complete enough to be a Journal of Halacha and Contemporary Society article. –  msh210 Sep 8 '11 at 22:46
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why should it be asur? –  Shmuel Brin Sep 8 '11 at 23:06
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I think every shul should have one and yeshiva for the Beis Medrash –  Chalutzhanal Sep 8 '11 at 23:34
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@tom smith Well if Reuven is happily walking by talking to person Shimon, and the jammer is turned on, the conversation will hereby be dropped. Or better yet, Reuven is in shul and needs to call Hatzolah -- but there's no service!!! I can't think of a specific principle that would apply to this case, but cannot imaging it's perfectly okay –  yydl Sep 9 '11 at 1:36
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Via Google, I discovered this brief, indicating that three [unnamed in the brief] rabbis signed a letter encouraging jamming in synagogues. Anyone know more about this? –  Isaac Moses Sep 13 '11 at 19:32

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up vote 7 down vote accepted

I wrote to Business Halacha Institute and they answered that it is prohibited to do so.

As requested, here is the conversation:

Aside from the secular law ramifications (illegal in the US):

I would be interested in knowing how cell phone jammers fit into halacha, and what the reasons behind forbidding [or permitting] their use would be.

Also of importance: would the location of the jammer (ie. whether in public or private domain) have an effect on the halacha?

They answered:

Thank you for contacting us about this interesting matter. The answer to your inquiry is that it would indeed be prohibited for one to jam the signal so that others would not be able to use their cell phones. However, it is unlikely that the damaged parties would be able to collect anything from the “jammer.”

I then wrote back:

Many thanks for your quick reply. May I know the reasons for why it would be prohibited?

Also, would it make a difference if the purpose was for a Shul (once again, disregarding US law)?

And they subsequently replied:

Jamming the signal so that one’s phone does not work is at least a grama of damage to the phone since it is rendered useless. It is not likely something for which one could demand reimbursement but it is prohibited l’chatchila.

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What was the asker's original question? Did the asker ask the Institute about using a jammer in a synagogue? Or about using it in a non-holy place? And why did the Institute say that the use of the jammer was forbidden? –  unforgettableid Sep 9 at 18:20
    
@unforgettableid Updated answer with that info.. –  yydl Sep 10 at 1:01

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