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I work at radioshack. we had to read memos on them, blah blah blah.
basically they don't work. they DO put extra strain on the battery. but they only areas they give --SLIGHT-- amounts of boosting is analog areas. With digital (99% of all phones out there are digitial capible and you're probably using a tri mode. analog is only used in rual areas anymore) it's all or nothing. Either you can connect and hear the other person or you can't. simple as that.
Also, rat is correct to an extent. (and so incorrect at the same time... as nisses pointed out. That type of frequency doesn't apply to cell phones or much of anything for that matter these days. also, consider larger outdoor dv antenna's compared to bunny ears... yeah....) but the reason these are supposed to help is because they're supposed to be antenna amplifiers. However, they do little other than suck the life out of your battery and whatnot.
So in short, don't waste your time. Who's your cell phone carrier. if it's verizon there --might-- be help. ohterwise... go cancel your phone and get verizon. seriously. i'm not even on the dealer/employee plan or whatever and i swear by them.
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