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Has anyone had any experience with one of the various BOOSTERS offered for cell phones?  I am in a warehouse with POOR reception - so the need.  There are supposed inserts you put inside on the battery and others seem to be TOWERS of some sort.  I am using a BLACKBERRY.  anyone?

The ones that you place on battery (towards the inside of the phone) do not work.
There is a complete shield around the radio receiver and transmitter circuitry the only part of the radio system that is exposed is the antenna
Even if the radio signal does get to the additional radiating element it may not couple and end up just absorbing some of the signal.
a booster needs to be active booster to be effective. which is a RF amplifier tuned for the band in use.
Cellular is 800Mhz and PCS is usually 1.9GHz.
Ever since they went to totally internal antennas it is kind of hard to change to a antenna with a higher dB rating and there are a few different ways they measure and calculate the increase in signal levels.

You might be able to get with a carrier that offers femtocells. A femtocell is a router type that hooks to your internet and creates a "mini" cell tower so that you can have a strong signal in your house and routes the call over the Internet. I believe T-Mobile is the only carrier that offers this but I could be wrong.

Foster's right, the inserts aren't worth their weight in cammel shit. There are some boosters that work well, but you have to be within a certain range, usually about 50ft, for them to help. Best thing to do is NOT listen to the guy selling it, but go online and look at user ratings. They're not very cheap for good ones, so make sure you can return it if it doesn't work. I sold and repaired cell phones for 10 years and had a lot of experience with digital signal boosters from 2001 and on