📱 Phone Testing Tools

Essential tests for buying or selling iPhones and Android phones. Check screens, cameras, speakers, and prepare devices for resale.

✓ Test Before Buying ✓ Prepare for Selling ✓ 100% Free ✓ No App Download

🛒 Buying a Used Phone?

Run these essential tests before purchasing to avoid costly surprises.

  • • Dead pixel and screen burn-in test
  • • Camera functionality check
  • • Speaker and microphone test
  • • Touch screen responsiveness

💰 Selling Your Phone?

Document device condition and prepare for a smooth sale.

  • • Generate condition reports
  • • Data wipe preparation guide
  • • Test all functions for listing
  • • Maximize resale value

What to test, and what to replace it with

These tools exist to tell you whether a screen is worth keeping. If it is not, these are the panels worth running the same tests on instead.

LG C4 65 in OLED evo LG C4 65 in OLED evo

The panel most of these test patterns are written against. OLED is where the dead-pixel and uniformity tests actually matter.

Check price on Amazon →
Samsung S90F 65 in OLED Samsung S90F 65 in OLED

The main alternative to the C4 at the same size, and the one worth running the same tests on before you keep it.

Check price on Amazon →
Calibrite Display Pro HL Colorimeter Calibrite Display Pro HL Colorimeter

Test patterns tell you something is wrong. A colorimeter tells you by how much, and fixes it.

Check price on Amazon →
Dell UltraSharp U2722D Dell UltraSharp U2722D

The safe QHD desk monitor when a test turns up a panel you do not want to keep.

Check price on Amazon →

As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. Prices change, so check before buying.

Available Phone Tests

🔍

iPhone Dead Pixel Test

Check iPhone and Android screens for dead, stuck, or hot pixels. Essential before buying a used phone.

iPhone Android Tablets
Start Test
📸

Phone Camera Test

Test front and rear cameras for functionality, focus, and image quality issues.

All Phones Quick Test
Start Test
🔊

Phone Speaker Test

Test earpiece and loudspeaker for clarity, volume, and distortion issues.

Audio Test All Devices
Start Test
🎤

Phone Microphone Test

Check microphone quality for calls, voice messages, and video recording.

Voice Test Quick Check
Start Test
👆

Touch Screen Test

Test multi-touch, dead zones, and responsiveness across the entire screen.

Touch Test All Screens
Start Test
🔒

iPhone Data Wipe Guide

Complete guide to securely erase your iPhone before selling. Protect your privacy.

Selling Guide Privacy
Read Guide

Essential Phone Accessories

Universal Phone Mount

Perfect for hands-free testing and video recording

High-Capacity Power Bank

Keep devices charged during extended testing

USB-C Hub & Adapter

Essential for connectivity and data transfer

Frequently Asked Questions

How do I check for dead pixels on my iPhone?

Use our iPhone dead pixel test to display solid colors across your entire screen. Look for any pixels that don't match the background color - black dots indicate dead pixels, while stuck pixels may appear as red, green, or blue dots.

What should I test before buying a used phone?

Test the screen for dead pixels and burn-in, check all cameras, test the speakers and microphone, verify touch screen responsiveness, and ensure all buttons work properly. Our tools guide you through each test.

How do I prepare my iPhone for selling?

First, run all our tests to document your phone's condition. Then follow our data wipe guide to securely erase all personal information. Finally, generate a condition report to share with potential buyers.

Do these tests work on Android phones too?

Yes! All our phone tests work on both iPhone and Android devices. Simply open the test in your phone's web browser - no app download required.

Related Guides

Maximize Resale Value

How proper testing documentation can increase your phone's resale value.

Dead vs Stuck Pixels

Understanding the difference and potential fixes for pixel issues.

Legal Considerations

Know your rights when buying or selling used electronics.

Used iPhone Testing Guide

Step-by-step checklist for inspecting a used iPhone before you buy.

Used Android Phone Testing Guide

Everything to check when buying a second-hand Android device.