With the continuous development of science and technology, there are more and more intelligent products, and people’s life is more and more convenient. Now people have been used to the convenience of science and technology. Now they don’t need to do housework by themselves. They are completed by intelligent devices, such as sweeping robots, intelligent voice systems, etc., which can liberate our hands. Especially now the mobile phone has become a part of our life, it has become a must for our life, and it is more and more important to our life. Nowadays, smart phones have become indispensable communication tools for people, such as reading news online, communicating with friends, shopping online, etc., which has brought great impact on our lives. People’s demand for mobile phones is growing. Now there are many mobile phone brands for us to choose from, including Huawei, Xiaomi, Samsung and other brands, as well as some foreign mobile phone brands. People are often very confused when choosing mobile phones. < / P > < p > when people buy mobile phones, they should not only pay attention to the functions, but also pay attention to the brand of mobile phones. The iPhone was seen by many as a high-end brand in its early days. There are even cases of selling kidneys and buying mobile phones. However, with the continuous development of science and technology, more and more mobile phone brands are rising in the society. < p > < p > but when it comes to mobile phone brands, we must be curious about what kind of mobile phones the President uses. Do they also use Apple phones? This problem has attracted people’s attention. It turns out that this is not the case. When choosing mobile phones, the president pays most attention to the confidentiality of mobile phones. Because the president is a public figure, the security of private mobile phones is very important. According to some statistics, most of the president’s mobile phones in the world are blackberries. Although BlackBerry is not a mainstream smartphone brand and far less well-known than apple, its biggest advantage is its easy access to email and more secure code. As a result, blackberry, which pays more attention to network security, is favored by many leaders. German Chancellor Angela Merkel uses a specially customized BlackBerry with strong confidentiality. The Z10 phone was customized for her, with eavesdropping protection and a 2500 Euro encryption chip. If the cost of the chip is so high, the price of the whole mobile phone must not be low. According to reports, she has a BlackBerry Z30 to choose from, but she chose the standard keyboard Z10. After seeing her cell phone, someone joked about how much advertising money BlackBerry had given her. Former US President Barack Obama also uses BlackBerry. In Obama’s view, blackberry meets his office needs and is very smooth. He has said there is no need to worry about BlackBerry privacy. Former British Prime Minister David Cameron also chose BlackBerry as his personal phone. BlackBerry seems to be loved by many national leaders for its own advantages, but not all leaders like BlackBerry. For example, Russian President Vladimir Putin chose China’s ZTE mobile phone. Putin’s ZTE MTS glonass945 mobile phone is jointly produced by Russian company and ZTE China. It is understood that the mobile phone can accept satellite systems of various countries, and the navigation accuracy is as high as 93%. Of course, we can also see the friendly relations between China and Russia and Russia’s trust in China. According to the news, trump, the current president of the United States, only uses ordinary Android phones in his country, not Apple phones. However, there is not much information about specific brands and models. However, in the mining and comparison of many media, the conclusion is that Trump’s smartphone should be Samsung Galaxy S3. < / P > < p > in addition, some national leaders like to use mobile phones with special significance, such as those that represent the technical level of their countries. Former French President Nicolas Sarkozy and former Uruguayan President mujika are loyal supporters of their home-made mobile phones. < / P > < p > in fact, what brand of mobile phone is not important to the president, but the safety of mobile phone is important. After all, they are national leaders, and their information security should be highly valued. But surprisingly, the iPhone brand, which claims global security, is not popular among world leaders. < / P > < p > with the continuous development of science and technology, the functions of smart phones are more and more complete, and there is still a lot of room for development in the future. Now the president and ordinary people want their privacy protected, so the confidentiality of mobile phones is becoming more and more important. I believe that with the development of technology, our mobile phones can also have strong security features. What brand of mobile phone are you using now? 865 optimization is different? These mobile phones should teach you a lesson!