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 got this because when I was at work my office has terrible reception. When I had the iphone 4s my reception was spotty. I would occasionally get "no service" notices and never had more than 1 bar of reception when I was in my office. Frequently I had to go outside dial a call and then hang up as soon as it connected and then I could pull the reception back into the office for awhile.When I got the new i phone se my reception in the office disappeared altogether. I would everyday find new voice mail messages which would pop up while I was driving home from work. I had people tell me that they had called and the phone wouldn't even ring...just go straight to voice. The same with text messages. Basically I had "no service" as it said on the screen where the bars of reception normally show.I have had this antenna for a week now and placed it on the window pointing up. The difference is nothing short of miraculous!! I now have 2 bars instead of "no service" I haven't missed any calls and my messages all come through. The difference is like night and day.This antenna is designed for those of us who have zero or very poor reception. It picks up the weak signals and amplifies them enough that your phone can pick them up and you can then use your phone in an area that you previously could not.