You can't "boost" the reception with anything but an external antenna. That would entail drilling a hole in the side of your BB and using a soldering gun. The max power at which a cell phone can operate is dictated by federal law. No software boosting of the power level.
Some folks get something like a Femtocell signal amplifier for outside their house or office. They're kind of expensive and results are not guaranteed. ThinkGeek :: Cellphone Signal Extender