This is my first free))). In the smartphone in the settings included a signal level so that you can visually determine whether there is an effect from this antenna. I tried to apply in different places from the back of the smartphone, but I did not find any changes in the signal level.

The two I ordered came in time and form. They look good quality. Missing proof, maybe later I raise evidence.

I did not see the difference in the signal! Probably some shit! But I recommend the seller!!!! Fast!!!

The order did not take long. I'll check in the process of use, I'll add.

Do not try-do not recognize! Maybe also from covid will protect.