Cell Phone Signal Strength Booster Antenna for Cars and Trucks, Car Mount Passive Repeater Antenna - Automotive Reception Amplifier-Wireless Verizon AT&T Sprint, Tmobile, MetroPCS 5G 4G LTE by Cellet

Increased T-Mobile reception from 0 bars to 1-2 bars, indoors (home), in one isolated area (say, a couple of square feet). Trust me, it's great achievement. I tried different phones with no luck, and was almost ready to buy a re-transmitter (they typically cost north of $150). Caveats: 1. I first attached both pieces to the opposite sides of a window, and got no signal improvement. It was pain to remove them, I thought I'd break the windows. The 3M thing is "extra-hard" grade, which is probably permanent once it fully dries out. I used a sharp knife to carefully "spoil" 3M around the perimeter, and then applied constant pressure for a minute, so it gradually detached without breaking my window. Beware. Don't use included 3M until you're certain you've found best position. Use a simple scotch tape for experiments. Note: car windows are much stronger, I wouldn't worry about them. I'd worry about house windows. 2. It took me maybe 5 minutes to find a good spot and orientation of this thing. Turned out to be fully indoors! Attached to my monitor stand and pointing to the window at sharp angle. With all these caveats, it's still 5 stars due to the value for the price. Even if it wouldn't work for you at all, this thing has a good chance of working and considering the price of "experiments" with other equipment it's worth trying! It's kinda unfortunate to see such a low average review score for a thing that can work! (but maybe not always/not for everyone), just because of plentiful of 1 star ratings from people for whom it didn't work. If you're ready to pay significant moneys for "proper" solutions (such as buying an active re-transmitter, or changing phone provider, ...or maybe even moving?), I'd say give this passive repeater a chance.

Mobile service providers claim that this type of antenna does not work, and I have to agree with them. Installing it actually reduced my reception from 2 bars to NO bars! If you search the internet, you will find that passive antennas like this are no different than that battery compartment sticker that claimed to improve cell phone reception, block radio waves from frying your brain, etc. It doesn't work and it's a waste of money. I recommend buying a wired antenna that directly connects to your phone. If you phone doesn't have such a connection, then you may want to look into a different phone because nothing without a direct connection is going to work, and you may want to look into a phone that gets better reception (there are some -- just read the 3rd party reviews). I wouldn't recommend this product to anyone unless you just have money to burn. If so, please just send it to my PayPal account instead.

I know this is meant for vehicle use, but I figured that I had nothing to lose by trying it for my home office. In my home office, I would generally get only 1 bar on my cell phone at home (if I stand across the street from my home I can get 3 bars, so I know my home is a dead zone of sorts for cell phone signal strength). And after I used a big metal binder clip and clipped both the outside and inside parts of the antenna together and placed it on the flat metal base of a metal lamp near my window, and pointed the antenna towards the window (a single-pane window), I was getting 2 bars on my cell phone. I am very happy with this purchase!

What all can you expect for five dollars? My friend and I like to drive around and play Pokemon go, but she gets disconnected a lot. I work in remote areas, so I was looking for a way to get cell signals farther out anyway. I know some radio dudes, and they all told me there was no way this thing could actually do anything I tried this thing out, and it seemed to help... maybe... in one spot in town, but we decided it wasn't really doing anything. I mean, it wasn't hurting, so I left it on for a while, but there was no way it was actually doing anything, right? Turns out it was hurting, because the spot I put it in meant that when I tried to wash my windows, there would be a big squeegee drip going down the middle of the windshield... Time for this thing to go. I ripped it off, and pulled up the tape on both sides. Turns out there is some sort of circuit board with a lot of coiled wire on the inside one. That's... well... if you were going to make one of these so they did something, you'd need that... I picked up my friend, and we drove around to play our game. half the spots we'd found since I got this antenna suddenly didn't work for her at all, and were a lot harder for me to connect with too. I guess it was working. On the package, they note that if there is no cell service at all, this antenna will not be able to do anything, and even in areas where there is coverage, it supposedly will only add half a bar. I guess it was adding half a bar in some places around town. A lot of users got this for their homes, since it says that it can be used there too. The package I got said "For Vehicle use only." I'm not sure if ones for home use only exist or not. Antennas like this, if they can do anything, need to have their inner part and their outer part placed a specific distance apart. Auto glass tends to be a thin single pane of 1/16-1/4 inch thick. Home windows tend to be double-pane, with 1/2 to 2 inches between the panes. If you live in an old house with single pane windows, the ones for automotive use might work there.

UPDATE: While this didn't work for me with T-Mobile, I have been beta testing the Starlink DTC (Direct to Cell) service through T-Mobile and this does a great job of bringing that DTC signal into my truck. With this, I don't need to make sure my phone has a clear view of the sky as long as this antennae does. I'll give it another star Note: other user's experience may vary. This did not work for me at all. I have T-Mobile and while my phone is capable of 5G, most of the service in my area is LTE. There are 3 dead zones on my drive to and from work. Between 1-3 miles each. Placing my phone up in the windshield helps some, so I know there's signal out there. But with this antennae, there was no change. It does look cool on the truck, and it's cheap enough keep it on just as an accessory.

I got this after I lost my Wi-Fi service and was left just using my phone to stream. I only had at least one bar reception. Everything was buffering endlessly, and it was really annoying me. The price on this was so inexpensive. I thought I didn’t have anything to lose by trying it. I just put it in my window, and it works (in one room, with the cell phone about 5 feet away from the repeater). I just finished watching a movie without any buffering whatsoever. Is it going to be the end of my problems? I doubt it. But for as inexpensive as it is, what do you have to lose by trying it?

Does not work at all. No matter where I positioned the phone or where the antenna was positioned, it did not increase the strength of the signal. Yes, there was a signal, but I could only get one to one and a half bars, the antenna did not help at all. It ended up in the garbage.

My previous vehicle had a fiberglass roof (Jeep) and cell coverage was not problem in the fringe area I live in. But now my Suburban has a steel roof and coverage became troublesome. I didn't have high hopes for this but for the price I figured it was worth a try. And, being Amazon, it's an easy return if I don't like it. So I got it, installed it, and gave it a try. Driving around to areas where I'd previously had trouble and now I had no issues at all. But please be aware, there HAS to be a signal where you are. This does not create a signal out of nothing. What it DOES do is help bring the signal inside your car. It has to active components. Or as some reviewers stated, "no electronics". That's true. It's capacitively coupled THROUGH the glass it's mounted on. The outside antenna receives the cell signal, passes it through the glass, then the inside antenna radiates it inside the vehicle. This works both ways, and quite well.

Does help a bit when in backcountry.

In meinem PKW ist durch einbruchsichere Scheiben kaum Handyempfang möglich. Diese Antenne soll es verbessern. Nach ersten Versuchen kann ich sagen: Bisher ist der Empfang besser. Ob es wirklich an der Antenne liegt, kann man natürlich nicht genau festlegen.

De buena Calidad

I have little or no bars in the house as even outside the house I have to stand in the garden to get a bar this little gadget I took a gamble on as it was cheap and I have it on my living room window and it catches a signal I now have to bars in the house so I would say take the gamble and see if you get a better signal . I give 5 starts as I had zero signal and im happy I got my mobile in signal

Does absolutely nothing to improve your cell reception