How does AT&T 3G microcell help in boosted up signal?

I am really worried and frustrated of my at&t 3g signal quality. Well, its not like that it is not a good service. But when I am at my home, usually there is some kind of a signal problem. I need to mend this all as soon as possible. I read an article online where this was mentioned that at&t 3g microcell will help one to boost-up his signal! Is that true? Is there a device if this facility? Please tell me all that you guys know about the at&t 3g microcell and where can I get one for a good price. Will be waiting for an answer from your side. Thanks all.

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