PhoneCheck: Device Diagnostics

PhoneCheck helps you inspect a used phone before you buy it.
Buying a second-hand device from a marketplace, reseller, or another person? Run a guided hardware inspection and check the most important functions before handing over your money.
PhoneCheck walks you through practical tests and creates a clear inspection result based on the checks you actually perform.
COMPLETE DEVICE INSPECTION
Test important parts of the device through a simple guided process.
Screen Tests
• Touchscreen grid test
• Multi-touch test
• Dead pixel check
• OLED and image retention check
• Display brightness check
Audio Tests
• Main speaker
• Earpiece
• Microphone recording and playback
Camera Tests
• Rear camera
• Front camera
• Focus test
• Flash and torch test
Sensor Tests
• Accelerometer
• Gyroscope
• Compass
• Proximity sensor
• Haptics and vibration
Connectivity Tests
• Wi-Fi and network connectivity
• Bluetooth
• GPS and location
• Cellular connectivity
PHYSICAL INSPECTION
PhoneCheck also guides you through important checks that require visual or manual inspection, including:
• Side and volume buttons
• Charging port
• Face ID or Touch ID
• Screen condition
• Back glass condition
• Front and rear cameras
• Speaker and microphone condition
DEVICE INFORMATION
View useful information available from the device, including:
• Device model
• Operating system version
• Storage capacity
• Available storage
• Battery percentage
• Charging status
• Display information
• Sensor and camera capabilities
PhoneCheck uses public system APIs and does not claim access to restricted information that third-party applications cannot reliably obtain.
CLEAR INSPECTION RESULTS
After completing the inspection, PhoneCheck summarizes the results using easy-to-understand statuses:
. Passed
. Needs Attention
. Failed
. Skipped or Unavailable
You can quickly see which areas performed correctly and which ones deserve a closer look before purchasing the device.
RETEST PROBLEMS
Found something suspicious?
Run failed or questionable tests again without repeating the entire inspection.
SAVE YOUR INSPECTIONS
Keep previous inspection results on your device so you can review and compare devices later.
BUILT FOR SECOND-HAND BUYERS
PhoneCheck is useful when checking a device from:
• Facebook Marketplace
• eBay
• Local marketplaces
• Used-device stores
• Refurbished-device sellers
• Private sellers
PhoneCheck reports only the results of tests performed using the app and user-confirmed inspection items. It does not guarantee a device's authenticity, ownership status, repair history, future performance, or overall condition.