OFFGRID by EDEC - Cell Phone Faraday Bag with Window - Signal Blocking, Anti-Tracking, Anti-Spying, EMP Protection for Cell Phones, Key Fobs and Credit Cards

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.

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.

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.

Wanted a bag for some key fobs and this did the trick perfectly. It is about the size of a clutch purse and if I really stuff things in it, it can fit a set of keys, my phone, some credit cards, and a passport. I tested it out by putting the key fobs inside the bag and holding them next to the fob sensor -- they didn't trigger the sensor from inside the bag. Also tried streaming music on my phone then dropping it into the bag, which cut off the music completely. I've used the bag every day for the last couple months and the velcro has held up well to repeated use. I wish the bag did not have obvious markings or text on it because it would look a little more minimalist/stylish without. I do like that this was made in the USA and that makes me more confident in the quality of the liner.

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

I have a iphone 5c. It fit in the bag nicely. I left the phone turned on. I turned down the bag and velcroed it. I called the phone with another phone. No call came through. I was excited. I turned on the computer to access my find my iphone app. Which is gps. It did not find my iphone. I was excited.I turned off the iphone I put it in the bag. No gps still. I was just so happy.It is big enough for me to stick my credit cards and drivers licence in it. I am very grateful for the extra room.I have a survivor case and the phone still fits nicely with extra room in it for the case and my extra things.Should this ever wear out I will buy the same product again.