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How to Boost Cell Phones signals?

   I use a LG cell phone which is old by now and face problem in capturing signals properly, which results in disturbance while talking. I am not in budget to buy a new cell phone, decided to have a cell phone signal booster. But I do not have any idea about the signal boosters so any one of you who have any idea about it then please do shear with me, also give some tips to install the instrument to boost the cell phone signals.