Step 7: Testing

-Take your cellphone and place it in the wallet and call it while holding the top of the wallet closed.
If it doesn't ring the wallet probably works!

<p>First and foremost, does your credit card actually have an RFID <br>transmitter? The vast majority does not. Have you ever been told you can<br> hold up your credit card to a wireless payment terminal, and without <br>inserting your card, pay for something? For most of my friends, and the <br>world in general, the answer is no.</p><p>So why u r weasting time for an aluminium foil,..</p>
<p>Much better than DUCT tape and aluminum foil:</p><p><a href="http://www.homedepot.com/p/Nashua-Tape-1-89-in-x-9-8-yds-Multi-Purpose-HVAC-Foil-Tape-1198777/100187909" rel="nofollow">HVAC Foil Tape</a></p><p>http://www.homedepot.com/p/Nashua-Tape-1-89-in-x-9-8-yds-Multi-Purpose-HVAC-Foil-Tape-1198777/100187909</p><p></p>
I read that aluminum foil isn't good at bloxcking rfid chips. rfid chips can allegedly be read &quot;through cars&quot;! It makes me wonder how effective the commercial products are...
<p>Using a cellphone to test RFID shielding is a very simple and useful tip, maybe I'll also make a little RFID jacket for my cellphone !</p>
<p>hopefully i am not displaying my ignorance of physics and manufacturing but is there any polarization effect if you rotate the pieces of foil - will this increase the efficacy or is this just a waste of foil?</p>
An OK idea for the seriously broke or cheap. However the downside of using any tape, inc. duct tape (not 'duck', mercy on our billed cousins!) for a permanent 'fix' is that after a while the glue comes off and leaves very hard to remove deposits on whatever it touches (inside your back pocket in this case). I know this from sad experience. Better off buying a purpose-made shielding wallet, card pouches, or in-wallet RFID jammer such as ArmourCard.
I recently did some research on this as my wife got skimmed, I found this cool product made in Australia called Armourcard, it jams RFID signals and fits in a wallet. Pretty cool we both have one now. <a href="http://www.armourcard.com.au/" rel="nofollow">http://www.armourcard.com.au/</a>
couldn't you just line your wallet with a brass mesh? Or would that be too expensive?
It's called AlFoil. Cheap, suitable, able to shape into a helmet XD. Not sure about brass but aluminum foil is well known on instructables for blocking/boosting signals. Also, you can get Aluminium foil/tape which may be more convenient. Nice instructable *Votes*
Quotes self: *Votes* Not in a competition >_< soz to get ur hopes up.
...also very easy to form into a tinfoil hat!
Thanks for the info about RFID! Its awsome people like you that share good info that most people need to know about :) cheers!
They already have RFIDs in money. Its those magnetic strips in them.
That is not rfid
"Probably works" ... nice. Going to Defcon this year, gonna have to make these. Nice job BTW! I would have loved to see you put more work into the design of the wallet, like the all of the other duct tape wallets out there.
<a rel="nofollow" href="http://www.i-hacked.com/content/view/208/48/">http://www.i-hacked.com/content/view/208/48/</a> <br/><br/>newby, your too late. plus the guy on I-hacked left some tin foil showing which is a plus over this<br/>
I did not get the idea from this site, I got the idea of using tin foil from wikipedia and did the rest myself. I don't understand why you are calling me a newby. I am not to late. The one on i-hacked looked bad because it had tinfoil showing and they did not even come up with a way of testing it.
OK this will prove your are a blind noob<br/><br/>Tin foil show is what makes it better because otherwise it would just look like a duck tape wallet. Also shiny stuff is awesome.<br/><br/>Secondly you must be totally blind because the one on I-Hacked DID test it, read the second paragraph<br/><br/>&quot;It seemed to be pretty well known online that aluminum foil prevented the transmission of RFID signals. '<em><strong>A quick test at my work place using my badge confirmed this.'</strong></em> The next step was to design a wallet with aluminum foil embedded inside. Using the plans to make Duct Tape Wallets I created previously, it was simple to modify them to include the aluminum foil.&quot;<br/>
'DUCT' tape, not 'duck' tape. called so because its use in HVAC 'duct' work.
actually, IIRC, it was originally used by the US army to repair amphibious vehicles, hence, duck tape
ACTUALLY, The US Army adapted duct tape from HVAC or some other duct worker during WWII because they needed tough water resistent tape. First it was duct, then it adapted duck. Don't you love it when we are all right? :)
No, no, no. You're all only half-right. The US Army needed a waterproof tape for sealing munition boxes. Johnson and Johnson added a waterproof layer to some of their medical tape and the army was good to go. It was called "duck tape" because it was waterproof. When the war ended, the people doing HVAC work started to use it to repair gaps and fix seams. They coloured it grey to blend in with the HVACs. At this point it was re-named "duct tape" because it was used on ducts. So either work, but "duct" is a bit nicer than "duck" because people know that you're talking about the type of tape in general, and not duck brand duc-k/t tape.
NOOOOOO, HVAC adapted it first, here, ill look it up =P<br/>
hmmmmmmmm your right actually... here you go anyways Duct tape (sometimes called duck tape; see under Etymology) is a vinyl, fabric-reinforced, multi-purpose pressure sensitive tape with a soft and tacky pressure sensitive adhesive. It is generally silver or black in color but many other colors and transparent tapes have recently become available. With a standard width of 17⁄8 inches (48 mm), duct tape was originally developed during World War II in 1942 as a waterresistant sealing tape for ammunition cases.[1][2] Permacel, then a division of Johnson & Johnson, used a rubber-based adhesive to help the tape resist water and a fabric backing to add strength. It was also used to repair military equipment quickly, including jeeps, guns, and aircraft because of these properties. In Canadian military circles, this variant is known as "gun-tape", typically olive-green, and also known for its resistance to oils and greases. Duct tape is also called "100-MPH tape" in the military [3], because soldiers often refer to something that exceeds expectations as "High Speed." After WWII, the housing industry boomed and people started using duct tape for many other purposes. The name "duct tape" came from its use on heating and air conditioning ducts, a purpose for which it, ironically, has been deemed ineffective. Its strength, low cost, and remarkable versatility make it a household staple throughout North America and Europe for temporary repairs and general-purpose use. THERE, solid proof...
niiiiice. fail<br/><br/>-<br/>SOMEONE IS <strong>WRONG</strong> ON THE INTERNET. lulz<br/>
BTW, It can be called both, but mor popularly 'DUCT'
i think duck is a brand like romex
here is your proof! <a rel="nofollow" href="http://duckproducts.com/about/">http://duckproducts.com/about/</a><br/>
Cotton duck is a heavy, tightly woven, cotton fabric (generically referred to as canvas) . This is the fabric that is in DUCK tape... and is, in fact why it's called duck tape. The name comes from from the Dutch word doek meaning a linen canvas which was used for sailors' clothing. This usage predates both WWII and central heating. Just as with the fabric the tape a tighter weave and higher thread count equals a heavier, stronger, higher quality product. Call it by either name and people will know what you're talking about... and argue :)
duct work with duck/duct work stopped becuse of its ironica ineffectiveness.
duck/duct TAPE lol
If the tin foil shows then it is exposed and can be damaged. He tested if tin foil works NOT his wallet.
very fashionable
It is a rather baddish and fashionable product,I love it.
Cute Dog! I guess I will have to update my DT wallet to be RFID blocking. Well, here goes another layer of DT! ~RoAr
Thanks for the Instructable. interesting
I'm going to have to try and make one of these, along with a mobile phone sock containing Tin Foil (I'm sure my blasted phone is still sending out signals even when it's turned off). :D Thanks for the Instructable.
how would you recieve a call or a text
Who keeps their phone in their wallet?
I dont get it- why do you want to block RFID signals? Could you be tracked with them or something?
Do you have any plans for a tin foil hat so they can't read my mind? Very annoying, that mind reading.
why not make the same thing without tinfoil and make the outer opening layers a pouch and put a bunch of lead shot in there... it may be heavier but it'll protect you from those darn X-rays at the airport.
where you get camo DT? ME WANT KNOW NOW!!
where did you get that cool duct tape Great instructable -sk8erdude
wal-mart, near the paint.......all kinds of colors.......or the huntin/ sporting goods isle...i wanted blaze orange figured they'd have it with the other orange hunting appearal, nope,camafloge not orange go figure, but they did have it in the duct tape isle....even had purple....not sure what u'd use purple duct tape for but i got some anyway.....LOL btw they do make a tinfoil type tape also......not sure if that would work or not......
I believe the tinfoil type you're talking about is flashing tape. You run it around windows and such after they're installed in a house. It's not very flexible though.
Huh, I guess I'm not the only one who has thought of this. I never figured to use a phone to test if it locks radio waves though. Are you sure RFID and GSM operate on similar enough frequencies for that test to be reliable?
Depends on the tag, some tags operate closer to GSM frequencies others don't. For example the "EM-4001" compliant tags run at 125kHz GSM runs in the GHz band. (near microwaves) as does bluetooth, wifi etc
GSM: 800 -900 RFID: 3000-300 The idea is to make sure the faraday cage works.
Microwave your money for 15 seconds, it will burn up the RFID chip inside. 8-)

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