Phonetone Cell Phone Signal Booster, Boosts 5G/4G, Smart, Compatible All US Carriers, FCC Approved

does precisely what it says on the box, exactly 20 db boosting for cellphones even underground,provided of course you bring the square reciever to a window and point the 'yagii antenna' toward the source, best configuration is to use signal detector and lte discovery apk's on your cellphone and search around for the cleanest hotspot in the house, then setup the antennas neerest to it(move the heatsink and the power supply as far away as possible from the antennas and not betwen your cellphone), face bald part(metal surface) of the square antenna exactly opposite of the cellular towers gps location and strap it in place, then take the yagii antenna and either face it FLAT*wide surface area facing horizontal to the cellular tower, or ground the yagii antenna into the corner of 2 walls to act as a mesh booster without interferring with the square antenna(acting asa large metal conductor and nothing more), at night i can get 20 megabytes per second cellular hotspot(5guw) with this configuration and u can get even further gains if u install the proper(non fake) version of app freezer from google play store > give it system permissions > block all bloatware and assign bloatware to various hidden system apps that arent required to function - basically if u disable absolutely everything but the launcher apks, knox systems, and phone internals you will get insane signal quality and internet speeds, much akin to how it was with windows 2000 anda high speed internet connection; how it should be the only things i would change is to include a loose heatsink farad box to prevent noise(magnetic and infra) from the devices own heatsink, and both increase the length of the power supply adapter cable and use wire shielding technique that is used in the braiding and shielding of cat8 network cabling, perhaps even use that asa medium instead of standard el-cheepo wire that adapters often use. all in all superb product.

Our cell phones would not work in our house after we got a metal roof. We purchased the cell phone booster from Walmart online. It arrived promptly. After installing the booster according to the directions, our cell phones work better inside than they do outside. I am very satisfied.