I have read some positive and some negative on these. I bought four to test on different phones and to test two on one phone.

Rather than type a lot of detail, I'll simply say, these did absolutely nothing. If I had one bar before, I had one bar after. Two bars before, two after. Zero? Definitely zero after. This was true on a Dash, RAZR, and Samsung T629. Style, make or model did not matter.

Contrary to what I have seen some say, putting two on a phone made no difference.
I have read some positive and some negative on these. I bought four to test on different phones and to test two on one phone. Rather than type a lot of detail, I'll simply say, these did absolutely nothing. If I had one bar before, I had one bar after. Two bars before, two after. Zero? Definitely zero after. This was true on a Dash, RAZR, and Samsung T629. Style, make or model did not matter. Contrary to what I have seen some say, putting two on a phone made no difference.