Picture of Modifying a Cheap Portable Cellphone Jammer
This instructable is going to show you a quick process which will allow you to convert a cheap portable cellphone jammer from Chinese frequency's (I think) over to American or other regions frequency's.

Specifically this model from

  • Important Note: Usage and purchase of this item may not be allowed in certain countries. It is your responsibility to check for your local regulations.
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Step 1: Dissasembly of the Jammer

Picture of Dissasembly of the Jammer
In this step we will simply want to remove the top and bottom plates from the outer casing.

You will need:

- A small phillips head screwdriver
- a pair of pliers - optional

The first thing you're going to want to remove is the three antennas because the top plate will not come off properly with them attached. Next, there are four small screws which hold the top and bottom plates to the aluminum casing, remove these screws and then remove the on/off button from the side using the pliers or your fingers, pretty simple.

Make sure you don't lose the screws, put them aside with their respective cover piece.

Step 2: Removing the inner circuit board and locating the adjustable caps.

Picture of Removing the inner circuit board and locating the adjustable caps.
In this step we will remove the inner circuit board and locate the caps we will be adjusting.

Once the top and bottom plates are removed the inner board will slide out with some slight pressure. Once the boards out you just want to find the 6 small variable capacitors towards the middle of the board.
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I agree to edro3111 , Cellphone jammer, sometime is very helpful to us, we can give it more good evaluation. Last month, i purchased one to test it, found that it can help me more,i like it.

I hear that many fake cellphone jammers on market now, really ? have fake cellphone jammers also ? god .

I bought one from, it seems that the device work ok by now !

alexis.bautro2 months ago

Do you have any schematic diagram of this?

sshockney6 months ago
link is bad, where els can I get this? I really like this instructable.
muddog1511 months ago
This is mall mayhem. Everyone's phone stops working. ;D
hazenoff6 years ago
What about finding larger capacity antenna's to pop on this and make it block cell service in a whole area? Just in theory, expanding the range, by pushing this through a op amp, and pushing it to say, 7 dbi antenna' those on a Linksys wireless router? Just curious how far this could actually be taken, and still be portable.
and making yourself a even bigger target. why not just put a red bulls eye on a shirt. and wear that. when yr using the jammer. i kno this being read by the guys an gals at instructbles. so the whole zone 4 jammers should be taken down b4 they end up with a mess on their hands.
moofle6 years ago
What if the inner board won't come out - even with significantly more than "slight pressure"?
jonrb moofle6 years ago
there may be screws or little plastic catches holding it in... if not pry it away from the board (in one piece) and make a new container, with perhaps a better aerial!
or they might have crimped the sides of the cannel together. to make it hard to remove the board.
0girle jonrb6 years ago
ya mine has no wire so do i need to put one there???????
jonrb 0girle6 years ago
No wire to/from what?
0girle jonrb6 years ago
the red wire kinda in the middle .,
jonrb 0girle6 years ago
Oh Well if it worked without a wire before then it probly isnt needed.
elite146 years ago
Why must fun things be so illegal. In my class one student texts all the time and would love to have one to tick him off with. Then he would be angry with his phone. Pretty much I would use it on only him.
use a modified annoyatron from think . itill do pretty much the same thing, as well as put wierd stuff arcross their screens.
lol in my language arts class almost half the class texts and it would be hilarious for them to not be able to
itsachen5 years ago
Awesome instructable man. Does DealExtreme allow people from the US to buy it?
if u have a prepaid credit card. they'ill sell any thing to any one.
slimgrip6 years ago
Jay$ which 2 points have you soldered the switch to? cant see from the angle you took the pic from?
mattyt slimgrip5 years ago
hi chaps, i have a the same broken button problem with a similar device - did any of you get a more detailed photo of where the wires go? my electronics skills aren't great!
its the homeland people taking the units apart. to disable them. better buy more than 1. then have it shipped thro different services.
sylviago4 years ago
you bought the item at dealextreme? how long does it usually take for the item to arrive? i would like to try them out, i buy my products at chinabuye and it only takes less than 4 days for it to arrive.thanks.
up to 1 month to arrive. cuase the items arent always in stock. even when the site says its in stock.
static6 years ago
But what practical use does this have? Anyone who would jam cell phones, is just as inconsiderate as those dimwit cell phone users, who tempt others to use these devices. No one has the right to interfere with the service I and others pay for.
Verga static4 years ago
I teach high school and I don't want students texting test answers to one another, You have the right to your service, but not the right to facilitate fraud.
static Verga4 years ago
Can't the schools require students to keep the phones in their lockers, during class periods? Can't any phone found in the class rooms confiscated, to be returned only to a parent that goes to the school to pick it up? Respectfully how can the kids learn self discipline, when the adults in their live justify breaking the rules, when doing so makes it easier?
just because you make the rule doesnt mean they'll adhere. i was in high school a few years ago, i can say, most everyone who had a cellphone had it in class, even though they were considered contraband. now that i'm in the military, if you get caught with a phone on you in certain buildings, it's a security issue and it will be promptly destroyed in front of your face. saw it happen two weeks ago to this girl who wanted to text during breaks. they smashed her iphone 4 or whatever the hell the newest version is. im not sure if schools could make this rule though.
Certainly a school needn't to go to the extreme of destroying a phone. Confiscating phones taken into the class room, to be return only to a parent, that went to the school to get it wouldn't be too radical. the adults would be the only ones that would stand in the way of a reasonable action. What happened to the time when caught cheating meant an automatic failing grade on the exam for both parties, and failing the class entirely if the cheating didn't abate?
As long as it is the posted policy they can.

Usually 'school policies' are cleared with the districts attorney before posting them.
Don't be stupid, the mobile phone is an invaluable tool to education, I use mine all the time, for taking notes, to even photographing the whiteboard, but yeah, I hate the kids who just go onto fakebook all the time...
Man I'm getting old. No modern whiteboard, we called them blackboards, even if they where green. A cheap snapshot camera was too expensive for most kids to have. No matter taking photos with them was more expensive yet. Not mention actually having the photos of the board would be at least a week away if you lived in a rural town. I agree the phones can be a tool for the students to use, and have to see the degree to what the smart phones will become more useful tools for the students. As a student do you have any recommendations as how to deal with the inappropriate use of the phones in the class room?
I think a bit of common sense is needed with them... Silent mode, full attention paid to the subject of class, and the requirement to put the phones in your bags during tests. If anyone is obviously on facebook, the teacher should proceed to read the contents of the screen out loud to the class, for maximum embarrassment...

Then again, I am a TAFE student, (the Australian form of College) So phones and other tech are welcomed by the teachers, a zero tolerance high school will not, however...
ditto to that, and amen ! prisons and schools alike should have them, , short range of course. . 1300.00 will do the job. . for 40 130.00 they get bigger obviously.
I use it for people that are driving and texting. I have to stay pretty close until they give up and put it down.
I would like a bit more power/range.

This one does not cover all carriers. So far all I know of for certain is Verizon, it kicks me off instantly....
swilus static4 years ago
Capfl2k5 static4 years ago
You say that now. But try to enjoy a movie with someone behind you so inconsiderate to not put their phone on silent or vibrate. Sorry but that is the kind of person that deserves to get jammed.
ajsims static6 years ago
“No one has the right to interfere with the service I and others pay for.” You’re right. Like when I pay to go to the movies, or when I pay to go out to dinner. I paid for these services and cell phone use interferes with it. I do not have one of these devices but I can sure understand people that would be frustrated enough to get one. Judging by your comment and self admitted inability to find a “practical use” I can only assume that you are one of those people that obliviously trample on other peoples rights and then espouse to be morally and ethically superior with condescending comments such as this one. "as those dimwit" The bottom line, If everyone would respect everyone else’s rights, their would be no need for such gadgets.
edro3111 ajsims5 years ago
I agree 100% ajsims! I bought mine only for using at theaters, concerts and dinner. I finally got to use it last week at a 3-D movie. There were about 6 kids within 20 feet of me texting and talking well after the movie started. I reached in my pocket and hit the on switch. It was hilarious to see them all lose their signal and go to the lobby to try and get it back. I really enjoyed the movie and the quiet. I'll do the same next time I fork out 60 bucks for the wife at a nice restaurant and I don't have to listen to the guy at the next table loudly working a business deal on his phone like he wanted us all to hear. Nice and quiet dinner. Ahhhh. I love technology. I will never use it to intentionally cause grief to another person as long as they respect my rights and my space. The argument static has is moot as far as I'm concerned.
You are absolutely right. I don't want to spoil somebody's talking on the phone, but their blabbing spoils my visit to theatre or cinema. So I had to buy cell phone jammer. I do realize that I can be put to jail for using jammer but that's the only way I can protect my right to watch movie without being distracted.
static ajsims6 years ago
LOL, I didn't say cell phone users have the right to disrupt others with their jabbering. I said they have a right to to have their phone service interfered with with. These devices interfere with everyone's phone not just those, not those annoying others. Ever consider the fact someone may miss an emergency call with one of these jammers in use? I learned long ago not to sweat the small stuff, the dimwits are the small stuff. And I still don't know of a legitimate use for the jammers.
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