To determine the phone chip is a few nanometers, you can obtain information in the following ways. First, you can check the phone's specifications or official website, which usually mentions the chip manufacturing process, such as 7 nm, 10 nm, and so on. Second, you can find information about the phone in the phone Settings, and some phones will show the manufacturing process of the chip. In addition, you can also use third-party applications, such as CPU-Z, to obtain detailed information about the phone chip, including the manufacturing process. Finally, if the above methods are unable to obtain accurate information, you can obtain more information about mobile phone chips through search engines or consult the customer service of mobile phone manufacturers.