The most common technology and very essential for everyone in the world that advancing day by day is the mobile technology. Due to the benefits and awareness about mobile technology we all are ignoring its side effects. Because signals generated by mobile technology with radio waves and high frequency energy are very effective for human body. One of the major side effects which use to be caused by mobile phones is brain cancer. “Specific Absorption Rate” that is the only way to measure range and energy of high frequency waves which gets absorbed by human body. Because Cellular Telecommunications Industry Association (CTIA) have been also said that mobile phones releases signals with the help of radio waves with radio frequency energy. According to Cellular Telecommunications Industry Association (CTIA) cell phone radiates radiations with maximum output power up to 3kilowatt that is very harmful for our brain because radiations directly attacks the brain. Cellular Telecommunications Industry Association (CTIA) had been proved that maximum power radiation doesn’t get proper signal and cause diseases like brain cancer. This study mead to the invention of an Cell phone signal amplifier or cell phone signal repeater. These devices are called cell phone signal booster or mobile phone booster because of working of these devices that is increasing the strength of weak signal or boosting the signal level almost 3 to 5 times the original coming from tower. A cell phone signal repeater or booster is the revolutionary product as it helps to minimize the fear of brain cancer due to cell phone signal radiations. Improvement of signal reduces power output of cell phones and improves the battery life because after installation of cell phone signal booster phone will not spend a lot of power on search of network. One more benefit of cell phone signal booster is to reduce the radiations emitted by cell phones. Due to advancing of mobile technology need of cell phone signal booster device is increasing. mostly recommended and used cell phone antenna repeater model is yx500 cell phone signal booster. iBooster is famous because it is only for iPhones. Due to its popularity it has costly prices, but we have iBooster for lowest price. The bottom line is that cell phone signal repeaters not only helps to improve signal strength but also helps to decrease the risk of brain cancer which could be caused by radiations of any cell phone.