How to copy APK program directly to Android phone for execution?

If you want to install unofficial software, you must make the necessary settings for the Android system. Open the "Application" item in the "Settings" menu and check "Unknown Source" to allow the system to install unofficial software. The Android installation package can be a program with the extension apk. You can directly copy the apk program obtained from forums or other channels to your mobile phone for direct execution. However, it should be noted that the Android system will prompt the mobile phone permissions involved in the program before installation. If you are wary of authorized applications, such as the use of SMS management by file managers, you should be careful: it may lead to a fee deduction trap or block some SMS messages, causing your confusion. (The above content is only applicable to Guangdong Unicom users)