At present, the communication is very important. Mobile phones help communicate it is easy and convenient. The problem of the mobile network is the signal with limited field do not cover all areas. These problems can be solved, by adding the antenna signal to expand the signal area network covered. The evolution of mobile phones has developed around and have a great influence on the 20 because it can help people who are so far, people who live abroad. Including the foreign land, can communicate to each other. The most important thing is to help facilitate the mobile communication for many people. The development of communication in the 21st 21 might be added the antenna signal to signal to cover all areas. If you have a cell phone. Can communicate easily and quickly. Some problems of lack of contact in areas without signal mobile networks