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USB debugging is an Android Developer options setting that allows a computer to communicate with a phone or tablet through Android Debug Bridge (ADB). It is mainly used to install and troubleshoot apps or run commands during development—not for ordinary phone use.
What does USB debugging do?
When USB debugging is enabled and the connected computer is authorized, ADB can communicate with the Android device. Developers use it to install and debug apps and to access a device shell for command-line actions. The setting does not itself install an app or run a command; it enables the ADB connection.
ADB is included in Android SDK Platform Tools, available from Android Developers. A computer must use ADB, and the device must permit that computer to connect.
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Open Settings and locate Build number. Its location varies by device and manufacturer. On Android 4.2 and later, tap Build number seven times to reveal Developer options. Android’s Developer options guide lists paths for different Android versions.
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Open Developer options and enable USB debugging. On phones running Android 9 and later, the documented path is Settings > System > Advanced > Developer options > USB debugging; manufacturers may arrange menus differently.
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Connect the device to the development computer with a data-capable USB cable. A cable that only charges the device will not provide the data connection. Android’s hardware-device setup guide covers USB and Wi-Fi workflows.
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From the computer’s SDK Platform Tools directory, run
adb devicesto check whether the device appears. If the phone displays an RSA authorization prompt, unlock it and approve the computer only if you trust it.Special offer. See more information about Outbyte and uninstall instructions. Please review EULA and Privacy policy.
What is the RSA authorization prompt?
On Android 4.2.2 and later, a connected computer must be authorized on the device before it can execute ADB commands. Android explains that the safeguard prevents USB debugging and other ADB commands from running unless someone can unlock the device and acknowledge the prompt. Do not approve a prompt for an unfamiliar or untrusted computer.
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Is USB debugging safe?
It is a development feature that grants an authorized computer ADB access, so it is not necessary to leave enabled for routine phone use. Use it only when you need it, approve only trusted computers, and turn it off in Developer options when you are finished. Android also documents revoking ADB debugging authorizations, which removes previously approved computer access.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Can I debug Android without a USB cable?
Yes. Android 11 (API 30) and later support wireless debugging for phones, allowing app deployment and debugging from a workstation without a physical USB connection. The workflow requires pairing the device with the workstation. Supported Android TV and Wear OS workflows have different minimum versions; consult the ADB documentation for device-specific requirements and pairing steps. Remove a pairing or revoke debugging authorizations when you no longer need that access.
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USB and wireless debugging serve the same broad ADB purpose, but the connection requirements differ: USB uses a physical data connection, while wireless debugging requires supported software and a pairing workflow. Neither method is universally better for every setup.
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