OFFGRID Non-Window Faraday Bags for Phones | Signal Blocking & Anti-Tracking | Made in USA | Fits Smartphones & Key Fobs | Durable ISOTech Fabric | Privacy Protection for Data Security

I looked at dozens of Faraday bags on Amazon before selecting this one, based pretty much entirely on the reviews. I was a bit apprehensive since this one is considerably more expensive than most. At the end of the day, it's a sheet of metal fabric wrapped in cloth.This bag exists for only one purpose: to block cellular RF signals from whatever's inside. Either it works as promised or it doesn't. As such, I tested it by dropping my phone in the bag, folding the top over twice as directed, and immediately calling it from another phone.The verdict? It worked. My phone could not be found by the cellular network and the call went to voicemail.A couple things to note:1. The density and composition of the mesh fabric determines the range of radio frequencies that are blocked. I'm satisfied that the bag does indeed block common cell frequencies, and others have claimed that it also blocks the frequencies of wireless car key fobs. Beyond these, I wouldn't expect this bag to block devices like AM/FM radios, ham radios, walkie-talkies or the like.It may block Wi-Fi and/or Bluetooth; I haven't yet tested this.2. Many people (including manufacturers) claim these bags also block GPS signals. Whether they do or not isn't really relevant since GPS signals are one-way: they fall from the GPS satellites onto your device, which computes your position based on the strength of signals received from multiple satellites.GPS-enabled devices do not transmit anything back to the satellites (in fact the satellites are not equipped to receive anything from customer devices -- they are one-way, transmit-only devices).If you're concerned about your device betraying your location, blocking the cellular signals is what you want. Once your device has computed its location via the GPS radio, that data can only be sent back to interested parties (such as apps, for example) via the cellular network, Wi-Fi, or in some cases a connected bluetooth device. If your device cannot be found on a cellular network or Wi-Fi network, your GPS-computed location cannot be leaked.The bag itself appears to be well made. The outer fabric and stitching looks strong. Not sure what the point is of the clear plastic pouches -- anything in these pouches will most certainly not be protected. Also, the "fold top over twice" business is messy and results in a sloppy looking bag. A better mechanism, even snaps or a buckle, would look better and be more secure. The bag's natural tendency is to unroll itself when fastened with the hook-and-loop mechanism. This tendency probably isn't strong enough to completely unroll, but it could have been avoided with a better fastening scheme.

Thing totally works. Just remember if you have a case on your phone to protect from dropping, scratching etc. You might need a bigger size than ya think. This one is a tight fit for my Galaxy in it's shock resistant case, but it really works so I'll be buying the next size up so it also fits credit/debit cards and car fob...I think the tablet sized one is probably perfect.

Upon initial testing, this bag seems to work as advertised. I placed an FM radio receiver in this bag while tuned to a station and the radio went completely silent as soon as I placed it inside the bag, as soon as I pulled the radio out of the bag, the radio started playing again. I then tested with two walkie talkies with one walkie talkie in the bag, and the other walkie talkie outside the bag about 3 feet away. Although I did hear the walkie talkie in the bag when I transmitted on the other one, the signal was noticeably noisy and not clear. Basically it was equivalent to having the walkie talkies a mile apart from each other even though they were only 3 feet away. This means the bag is at least attenuating 99% of the signal which is impressive and should be sufficient. Next test I placed a cell phone inside the bag and when I tried to call it with another phone it would not ring and went to voicemail.

I bought the Black Hole Faraday bag recently to use for keeping my key from communicating with my car during camping & car-camping. The first thing I did throw my iPhone 6s+ in there, rolled it up twice to the Velcro, and tried to call my phone multiple times and it went to voicemail each time. In fact, when looking at my phone it didn't even register that I had a missed call! This shows that it was able to block cell phone signals.For the keyless system in my Subaru Outback, I put the key in the Faraday bag. First, I tried opening the door with the bag open and it blocked the signal (the opening was faced upwards). Then I rolled it up and of course it was blocked the signal. After that I took it out, opened the door, then put the key back in the bag & rolled it up. The car didn't sense the key! I took it out and immediately my car was able to start.If you are worried that your key will drain your car battery when camping or car-camping then just buy this bag and put your worries to rest!

Total block out for critical times. No signal gets through. Bag could be smaller by one quarter, but works well.

Forensic technologists and the privacy-minded will likely find this product to be useful, perhaps even VERY useful.Although no extensive, forensic testing and analysis resulted in this review, the bag does enable the user to visually verify signal loss. The curious (as well as the novice user) should take note that interacting with mobile devices that are secured inside the bag can be awkward and tricky, and that this particular model does not necessarily allow for the device to be connected to USB while inside the bag. There's a different model available for that.The bag itself is made of good, durable materials, has excellent seams and although the velcro will likely wear over time, it seems to do exactly what the description says it does.For those who simply want a little privacy, it's like a certain cartoon cat's "magic bag of tricks". Connections appear to drop the device completely off the grid, as also noted in other reviews here. Truth be told, I'd love to see a forensics expert's full and extensive opinion on exactly how sound this product really is.Tested on iPhone (1, 3, 3GS, and 4) and Android (HTC, Samsung) devices.Happy Mobiling (or Not?)! ;)