The iPhone 12 can be charged using the Mi charging head, but there are some issues that need to be noted. The output voltage and current of the Xiaomi charging head are different, which may affect the charging speed and battery life of the iPhone 12. If the output voltage or current of the Xiaomi charging head is too high, it may cause harm to the iPhone 12, such as overheating and battery aging. It is recommended to select the original charging head matching the iPhone 12 or a certified third-party charging head for charging to ensure the charging effect and security.