Android Error and Warning Messages List | Causes and Solutions Explained

Charging and USB Port

Message / Symptom	Main Cause	Solution
Moisture or Foreign Material Detected in USB Port	There may be moisture or foreign material inside the USB-C port.	Disconnect the charging cable and allow the port to air-dry. If there is foreign material, do not force tools or other objects into the port.
Moisture Detected	There may be moisture on the USB port or charging cable.	Disconnect the cable and avoid wired charging until it is completely dry.
Cannot Charge	There may be a problem with the cable, charger, USB port, battery, or another component.	Check the port and try another compatible cable or charger.
Charging Slowly	Charging speed has decreased because of insufficient charger output, cable specifications, or other factors.	Use a charger and cable compatible with the device’s fast-charging standard.
Cannot Fast Charge	The charger or cable may not support the required fast-charging standard.	Use a fast charger and cable compatible with the device.
Charging Temporarily Paused	The device temperature may be too high or too low.	Move the device to a location with an appropriate temperature and wait until the device temperature returns to normal.
Cannot Charge Connected USB Device	The power consumption or connection method of the USB device may not be supported by the smartphone.	Check whether the USB device is supported and use an external power source if necessary.

Battery

Message / Symptom	Main Cause	Solution
Battery Level Is Low	The battery level is low.	Connect the device to a charger and charge it.
Battery Level Is Very Low	The battery level has dropped to the point where the device may soon turn off.	Charge the device as soon as possible.
Battery Condition Is Deteriorating	Battery performance has declined due to long-term use or other factors.	If the operating time has become extremely short, consider replacing the battery.
Check the Battery	There may be a problem with the battery or charging circuit.	If restarting the device does not improve the problem, contact the manufacturer or a repair service.

Temperature and Overheating

Message / Symptom	Main Cause	Solution
Device Temperature Is High	The device temperature has increased due to direct sunlight, a hot environment, gaming, video recording, charging, or other causes.	Stop using the device and allow it to cool naturally in a place away from direct sunlight.
Device Is Overheating	The internal temperature is higher than normal.	Close resource-intensive apps, stop charging, and wait until the temperature decreases.
Some Functions Are Restricted Due to High Temperature	Functions such as the camera or charging have been temporarily restricted to protect the device.	Stop using the device and allow it to cool down.
Camera Cannot Be Used Due to High Temperature	The device has become hot due to camera use or the surrounding temperature.	Close the camera and use it again after the device temperature decreases.

Storage and Insufficient Space

Message / Symptom	Main Cause	Solution
Storage Space Is Running Low	Photos, videos, apps, and other data are using most of the device’s storage capacity.	Delete unnecessary photos, videos, apps, downloaded files, and other data.
Storage Is Full	Almost all of the internal storage has been used.	Check storage usage in Settings and remove unnecessary data.
No Free Space Available	There is no remaining space available to save new data.	Delete unnecessary files and apps to free up storage space.
Cannot Save Photo	Insufficient storage or a problem with the camera app may be the cause.	Check the available storage and restart the camera app.
Cannot Download. Not Enough Storage Space	There is not enough space to save the app or file.	Delete unnecessary data and try downloading again.

SIM and eSIM

Message / Symptom	Main Cause	Solution
No SIM Card	The SIM card is not inserted or is not being recognized properly.	Restart the device and, if using a physical SIM, check whether it is inserted correctly.
Cannot Detect SIM Card	Poor SIM card contact, a faulty SIM card, or a problem with the device may be the cause.	Reinsert the SIM card and contact your carrier if the problem does not improve.
Invalid SIM Card	There may be a problem with the SIM contract status or compatibility with the device.	Check compatibility between the SIM and device and contact your carrier.
SIM Card Is Locked	SIM PIN may be enabled.	Enter the SIM PIN that you set. Be careful not to enter it incorrectly repeatedly.
Cannot Activate eSIM	There may be a problem with the network environment, contract information, or carrier settings.	Connect to Wi-Fi and contact your carrier if the problem does not improve.
Cannot Add eSIM	There may be a problem with the QR code, contract information, or device compatibility.	Check the eSIM information issued by your carrier.

Cellular Network and Phone Calls

Message / Symptom	Main Cause	Solution
No Service	The cellular signal may not be reaching the device, or a network outage may be occurring.	Move to another location, toggle Airplane Mode on and off, or restart the device.
Emergency Calls Only	The device cannot connect properly to the contracted cellular network.	Check signal conditions, the SIM, and carrier outage information.
Mobile Network Not Available	Possible causes include signal problems, the SIM, network settings, or a carrier outage.	Toggle Airplane Mode, restart the device, and check the network settings.
Mobile Data Not Available	Mobile data may be disabled, restricted by the contract, or affected by APN settings.	Check the mobile data settings and contract status.
Not Registered on Network	The device has not been properly registered with the SIM or carrier network.	Restart the device and check the SIM and network settings.
Call Ended	A dropped signal, network problem, or the other party’s status may be the cause.	Check the signal conditions and make the call again.
Cannot Make Call	There may be a problem with the signal, SIM, contract status, or call settings.	Check the network status and SIM before making the call again.

Wi-Fi

Message / Symptom	Main Cause	Solution
Cannot Connect to Wi-Fi Network	There may be a problem with the router, password, or wireless signal.	Turn Wi-Fi off and on again and restart both the device and router.
Authentication Problem	This may appear when the Wi-Fi password is incorrect.	Check the correct Wi-Fi password and enter it again.
Incorrect Password	The entered Wi-Fi password does not match the registered password.	Check the password and enter it again.
Connected, No Internet	The device is connected to the Wi-Fi router but cannot access the internet.	Restart the router and check for an internet service outage.
Not Connected to the Internet	Neither Wi-Fi nor mobile data can connect to the internet.	Connect to another network or restart the network equipment.
Saved	The Wi-Fi settings are saved, but the device is not currently connected.	Check signal conditions, delete the network settings once, and register them again.
Failed to Obtain IP Address	The router is not properly assigning an IP address to the device.	Delete and re-register the Wi-Fi connection and restart the router.

Bluetooth

Message / Symptom	Main Cause	Solution
Cannot Connect	There may be a problem with the distance from the Bluetooth device, power, or pairing information.	Move the devices closer together, turn Bluetooth off and on again, and reconnect.
Cannot Pair	The other device may not be in pairing mode.	Put the other device into pairing mode and connect again.
Pairing Rejected	The other device may not be accepting the connection.	Delete the registration information from both devices and pair them again.
Bluetooth Device Disconnected	Distance, radio interference, or low battery may be the cause.	Move the devices closer together and check the battery levels of both devices.

Google Account

Message / Symptom	Main Cause	Solution
Cannot Sign In to Google Account	There may be a problem with the email address, password, or network environment.	Check the entered information and network connection.
Authentication Required	You need to sign in to your Google Account again.	Sign in to your Google Account again.
Identity Verification Required	Additional authentication is required for security reasons.	Follow the on-screen instructions to verify your identity.
Incorrect Password	The entered Google Account password does not match.	Enter the correct password or reset the password.
Account Action Required	Google Account authentication, acceptance of terms of service, or another action is required.	Open the notification and follow the on-screen instructions.

Screen Lock, PIN, and Password

Message / Symptom	Main Cause	Solution
Incorrect PIN	The entered screen lock PIN does not match the registered PIN.	Enter the correct PIN.
Incorrect Password	The entered screen lock password does not match.	Enter the registered password.
Incorrect Pattern	The entered unlock pattern does not match the registered pattern.	Enter the correct pattern.
Try Again Later	Unlock attempts have been temporarily restricted because of repeated failures.	Wait for the displayed amount of time and try again.
Device Is Locked	Access to the device has been restricted by a security feature.	Unlock the device using the registered PIN, password, pattern, or other method.

Fingerprint and Face Recognition

Message / Symptom	Main Cause	Solution
Fingerprint Not Recognized	Dirt, moisture, or fingerprint registration status may be the cause.	Make sure your finger and the sensor are clean and dry, then try again.
Fingerprint Sensor Cannot Be Used	There may be a problem with the sensor or system.	Restart the device and register the fingerprint again if the problem does not improve.
Face Not Recognized	A dark environment, face angle, or dirt on the camera may be the cause.	Check the camera and try again facing forward in a well-lit place.
Face Recognition Cannot Be Used	There may be a temporary problem with the camera or face recognition function.	Restart the device and register your face again.
Enter Your PIN	Biometric authentication cannot be used for security reasons, such as after restarting the device.	Enter the registered PIN or password.

App Stopping and Crashing

Message / Symptom	Main Cause	Solution
App Keeps Stopping	Possible causes include an app malfunction, corrupted data, or OS compatibility.	Close and restart the app and check for updates.
App Isn’t Responding	The app’s process may have stopped.	Close the app and open it again.
App Has Stopped	An error has occurred within the app.	Restart the app, and if the problem does not improve, try clearing the cache or reinstalling the app.
Cannot Open App	There may be a problem with app corruption, Android compatibility, or storage.	Update the app and Android and reinstall the app if necessary.
This App Is Not Compatible with Your Device	The Android version or device specifications do not meet the app’s operating requirements.	Check the supported Android versions and compatible devices.

Google Play Store

Message / Symptom	Main Cause	Solution
Cannot Download App	There may be a problem with the network connection, storage, or Google Account.	Check the internet connection and available storage and try again.
Cannot Install App	Insufficient storage, compatibility, or a Google Play problem may be the cause.	Check the available storage and supported Android version.
Download Pending	Another app may be updating, the device may be waiting for a network connection, or Google Play may have a temporary problem.	Check other downloads and reopen the Google Play Store.
Download Failed	A network disconnection, insufficient storage, or a temporary Google Play problem may be the cause.	Check the network connection and available storage and try again.
This Item Isn’t Available in Your Country	The app or content is not distributed in your current country or region.	Check the Google Play distribution region.
Your Device Isn’t Compatible with This Version	The device or Android version does not meet the app’s requirements.	Check the supported devices and required Android version.
Payment Could Not Be Completed	There may be a problem with the payment method, Google Account, or card information.	Check the payment method in Google Play.
Payment Method Was Declined	Possible causes include card information, spending limits, or restrictions imposed by the card issuer.	Check the payment information and contact the card issuer if necessary.

Android System Updates

Message / Symptom	Main Cause	Solution
Cannot Check for Update	There may be a problem with the internet connection or the manufacturer’s server.	Check the Wi-Fi connection and try again later.
System Update Failed	There may be a problem with the network connection, storage, or battery.	Check available storage and the charging status and try again using stable Wi-Fi.
Cannot Install Update	Insufficient storage or a problem with the update data may be the cause.	Free up storage space and try again.
Cannot Download Update	The network environment or a server problem may be the cause.	Connect to stable Wi-Fi and try again.
Restart to Complete Update	The update file is ready to be installed.	Save any necessary data and restart the device.

Camera

Message / Symptom	Main Cause	Solution
Cannot Connect to Camera	The camera app or another app may be using the camera.	Close apps that are using the camera and restart the device.
Cannot Start Camera	There may be a temporary problem with the app or camera function.	Close and restart the camera app.
Camera Error	There may be a problem with the camera app or camera hardware.	Restart the device, and if the problem does not improve, check the camera app data and device updates.
Another App Is Using the Camera	Another app is currently using the camera.	Close the app that is using the camera and try again.

SD Card and External Storage

Message / Symptom	Main Cause	Solution
Cannot Detect SD Card	Poor contact, a faulty SD card, or an unsupported format may be the cause.	Reinsert the SD card and check whether it can be read by another device.
SD Card Is Corrupted	The file system or the SD card itself may be damaged.	If important data is stored on the card, do not format it and first try reading it with another device.
SD Card Needs to Be Formatted	The device cannot properly read the SD card’s file format.	Back up any necessary data and then format the card in a supported format.
SD Card Removed	The connection has been lost because of poor contact or an SD card malfunction.	Turn off the device and reinsert the SD card.

USB and External Devices

Message / Symptom	Main Cause	Solution
Cannot Detect USB Device	The USB device, cable, or adapter may not be supported.	Check compatibility and try another cable or adapter.
USB Device Not Supported	The connected USB device is not supported by the Android device.	Check whether the device supports Android or USB OTG.
USB Device Power Consumption Is Too High	The connected device requires more power than the smartphone can supply.	Use a powered USB hub or similar device.

Location and GPS

Message / Symptom	Main Cause	Solution
Cannot Determine Current Location	There may be a problem with the GPS signal, location settings, or network environment.	Enable location services and move to a place where GPS signals are easier to receive, such as outdoors.
Location Cannot Be Used	Location services may be disabled or the app may not have permission to use location information.	Check location settings and app permissions in Settings.
Cannot Receive GPS Signal	You may be in a location where satellite signals are difficult to receive, such as indoors or underground.	Move to a location with a clear view of the sky and try again.

Backup and Google Drive

Message / Symptom	Main Cause	Solution
Cannot Back Up	There may be a problem with the network connection, Google Account, or storage capacity.	Check Wi-Fi and the status of the Google Account.
Backup Failed	A network disconnection or cloud-side problem may be the cause.	Connect to stable Wi-Fi and perform the backup again.
Cannot Sync with Google Account	There may be a problem with the network connection, account authentication, or sync settings.	Check the network environment and Google Account sync settings.
Sync Error	The device cannot synchronize properly with Google services.	Check the network connection and perform a manual sync.

Browser and Websites

Message / Symptom	Main Cause	Solution
Your Connection Is Not Private	There may be a problem with the website certificate or the device’s date and time settings.	Do not enter important information, and check the URL and date and time settings.
This Site Can’t Be Reached	There may be a problem with the internet connection, DNS, or web server.	Check the network environment and reload the page.
Server IP Address Could Not Be Found	DNS cannot obtain the website’s address.	Check the URL and network environment and try another network.
Connection Timed Out	The network may be slow or the web server may not be responding.	Check the network environment and try again later.
Dangerous Site	The website has been detected as potentially dangerous, such as a phishing or malware site.	Close the page and do not enter passwords or card information.

Email

Message / Symptom	Main Cause	Solution
Cannot Sync Email	There may be a problem with the network connection or email account settings.	Check the network status and account settings.
Cannot Sign In	The email address or password may be incorrect.	Check the login information and enter it again.
Cannot Send Email	There may be a problem with the network connection or outgoing mail server settings.	Check the network environment and email settings.
Cannot Receive Email	There may be a problem with the network connection, account authentication, or mail server.	Check the network status and email account.

NFC, Mobile Wallet, and Contactless Payments

Message / Symptom	Main Cause	Solution
NFC Cannot Be Used	NFC may be disabled, or there may be a problem with the device or app.	Check the NFC settings and restart the device.
Cannot Read Card	The position of the card, NFC settings, or a problem with the card may be the cause.	Check the NFC position on the device and move the card close to it again.
Contactless Payment Cannot Be Used	There may be a problem with the payment app, NFC settings, or card information.	Check the NFC and payment app settings.
Osaifu-Keitai Cannot Be Used	There may be a problem with the FeliCa function, app, or device settings.	Restart the device and check the Osaifu-Keitai-related apps and settings.

Security and Malicious Apps

Message / Symptom	Main Cause	Solution
Harmful App Detected	Google Play Protect or another security feature has detected an app that may pose a security risk.	Check the app identified by the warning and uninstall it if necessary.
This App May Be Unsafe	There may be a security problem with the app’s distribution source or behavior.	Check where the app was obtained and do not install it if its safety cannot be confirmed.
Cannot Install for Security Reasons	Apps from unknown sources or similar apps are restricted by security settings.	Check where the app was obtained and do not change the settings if the source cannot be trusted.
Blocked by Play Protect	Google Play Protect has detected that the app may pose a security risk.	Cancel the app installation and check the official distribution source.

VPN and Certificates

Message / Symptom	Main Cause	Solution
Cannot Connect to VPN	There may be a problem with the network, VPN server, or authentication information.	Check the internet connection and VPN settings.
VPN Connection Disconnected	A network disconnection or VPN server problem may be the cause.	Check the network status and reconnect.
Cannot Verify Certificate	The device cannot properly verify the certificate of the destination.	Stop suspicious connections and check the destination and certificate.
Certificate Has Expired	The certificate used by the destination may have expired.	Check the device’s date and time, and if there is no problem, contact the destination administrator.

Tethering and Hotspot

Message / Symptom	Main Cause	Solution
Tethering Cannot Be Used	There may be a problem with the mobile plan, mobile network, or device settings.	Check the mobile network and contract details.
Cannot Start Hotspot	There may be a temporary problem with the mobile network or Wi-Fi function.	Restart the device and enable tethering again.
Cannot Connect to Tethering	There may be a problem with the password, number of connected devices, or signal.	Check the password and connection settings and restart both devices.

System and Device Problems

Message / Symptom	Main Cause	Solution
System UI Isn’t Responding	The system process that manages the Android screen display has temporarily stopped.	Restart the device and update Android and the apps.
System UI Has Stopped	An error has occurred in a system process.	Restart the device, and if the problem does not improve, check the available storage and system updates.
Android System Isn’t Responding	An internal Android process may have temporarily stopped.	Wait for a while or restart the device.
Process Isn’t Responding	A system or app process has stopped.	Close the app or restart the device.
Please Restart Your Device	A restart is required because of a system update, temporary problem, or similar issue.	Save any data you are working on and restart the device.

Reset and Device Protection

Message / Symptom	Main Cause	Solution
This Device Was Reset	The device has been reset and verification using the Google Account previously used on the device is required.	Sign in with the Google Account that was used on the device before it was reset.
Sign In with a Google Account Previously Synced on This Device	Identity verification is required by the device protection feature.	Enter the Google Account that was previously used on this device.
Cannot Verify Device	There may be a problem with Google Account authentication or device information.	Check the network environment and account information.

Basic Troubleshooting Steps to Try First

If There Is a Problem with an App

When to Consider Repair or Support

If the same warning repeatedly appears even after restarting the device or checking the settings,
or if problems involving the camera, battery, USB port, fingerprint sensor,
mobile network, or other functions do not improve,
consider contacting the device manufacturer, mobile carrier, or retailer.

In addition, if a physical abnormality is observed,
such as excessive device heat,
a swollen battery,
failure to operate normally after being submerged in water,
or a burnt smell,
it is safer not to continue using the device forcibly.