When the mobile phone is out of power, everyone will habitually connect the power cord and fast charging head to charge the mobile phone. Many people do not realize that the charging interface is basically at the bottom of the mobile phone? Is there any reason for this? China Telecom has given popular science. It turns out that there are at least 4 reasons for this design. According to China Telecom’s explanation, the mobile phone interface is basically at the bottom, with the following considerations: The charging port facing down is not easy to get dust: as the mobile phone…