If iTunes won’t detect your iPhone, update iTunes and iOS, trust the computer, check cables and ports, and reinstall USB drivers.
When iTunes doesn’t see a connected handset, you lose backups, restores, and sync. Most cases come down to a few repeat causes. This guide gives clear checks that work on Windows and Mac.
iTunes Not Detecting iPhone — Causes And Fixes
Connection issues cluster into six buckets: cable or port faults, trust prompts not answered, device locked or USB access limited, old desktop software, broken drivers on Windows, and security tools that block Apple services.
Quick Diagnostic Table
| Symptom | Likely Cause | Fast Fix |
|---|---|---|
| Phone charges but stays missing in iTunes | Data pins not making contact or port lint | Try a fresh MFi cable; clean ports; switch USB port |
| “Trust This Computer” never appears | Lock screen, old iOS, or blocked trust state | Unlock, reconnect, and update; reset trust |
| Trust alert appears every time | Trust database out of sync | Reset trust settings and reconnect |
| Shows up in Finder or Apple Devices app but not in iTunes | Outdated desktop app | Update or reinstall the desktop app |
| Windows shows “Apple Mobile Device USB” errors | Driver problem | Reinstall the USB driver and services |
| Connects only when security tools are off | Firewall or antivirus filter | Allow Apple services; add safe exclusions |
Start With The Basics
Check The Cable And The Ports
Use a known good Lightning or USB-C cable from Apple or an MFi brand. Some charge-only cords carry power but not data. Swap the USB port. Prefer a direct port over a hub. Inspect ports and clear lint with a wooden pick.
Unlock The iPhone And Wake The Screen
The desktop app can’t talk to a locked handset. Unlock, then plug in. Apple’s help page on allowing USB accessories explains why unlocking matters and shows where to adjust the setting.
Answer The Trust Prompt
On first plug-in, iOS asks whether this computer can access data. Tap Trust and enter your passcode. If you chose Don’t Trust, open Settings > General > Transfer or Reset > Reset > Reset Location & Privacy to clear the list and try again.
Update The Desktop Side
Update Or Reinstall iTunes On Windows
Open Microsoft Store and get the latest release. If you installed the standalone build, download the current installer from Apple and run a repair.
Update macOS Components
On a Mac, device sync now lives in Finder or the Apple Devices app depending on macOS version. Use System Settings > General > Software Update to install updates.
Fix Driver Problems On Windows
Windows relies on Apple Mobile Device USB Driver. If that driver is missing or broken, the phone never shows up. Use Device Manager to check for warnings under Portable Devices or Universal Serial Bus devices.
Reinstall Apple Mobile Device USB Driver
Disconnect the handset. In Device Manager, right-click the device entry for the phone and choose Uninstall device. Check the box to delete the driver. Then reconnect and let Windows fetch the driver again. If it fails, reinstall the Apple components from the iTunes installer. Apple’s page on computers that don’t recognize an iPhone includes Windows steps.
Restart The Apple Services
Open Services and restart Apple Mobile Device Service, Bonjour Service, and iPod Service if present. Set the startup type to Automatic. Then reboot and test.
Rule Out Security Software Conflicts
Firewalls, VPN clients, and antivirus tools can block the ports or services that the desktop app needs. Create allow-lists for Apple Mobile Device Service, iTunes, and Bonjour, then retry.
If you manage a strict firewall, whitelist the executables that ship with the desktop app and Bonjour. On many setups, allowing outbound TCP on ports 3689 and 62078 and multicast DNS traffic helps the services talk. After changing rules, unplug and replug the cable to force a fresh handshake.
Deal With USB Access Limits On iPhone
iOS can block USB data when the handset stays locked. If the device still refuses to pair after you unlock once, open Settings > Face ID & Passcode (or Touch ID & Passcode). Scroll to the USB Accessories toggle and allow access while locked during testing. The Apple page on USB accessory access shows the control and privacy notes.
Repair Corrupted Pairing Files
Sometimes the local pairing records get stuck. On Windows, quit iTunes. Press Win+R, paste %ProgramData%\\Apple\\Lockdown, and delete the files inside the Lockdown folder. Then reconnect and approve trust again. On a Mac, open Finder and select Go > Go to Folder, then paste /var/db/lockdown and remove the pairing records.
When The Device Shows Power Only
Test With A Shorter Cable
Long or damaged cords can drop data lines while still charging. Try a shorter cable under one meter.
Bypass Hubs And Docks
Some hubs pass power but mangle data. Plug straight into the machine. If you use a desktop tower, try a rear motherboard port.
Reset Network And Location Settings
On the handset, go to Settings > General > Transfer or Reset > Reset. Tap Reset Network Settings to refresh drivers that handle USB tethering. If trust stays stuck, use Reset Location & Privacy and reconnect.
Update iOS And Try A Safe Boot
Software updates carry new device firmware and pairing fixes. Install the latest iOS build, then test again. For tough cases, force-restart the handset, boot the computer with startup items off, and plug in with a fresh cord.
Reinstall When Errors Persist
If the desktop app crashes on connect, or Windows shows repeated driver errors, a clean reinstall can save time. Remove the Apple desktop components, reboot, and install the current build. Retest.
Deep-Dive Troubleshooting Table
| Problem | What To Check | Outcome |
|---|---|---|
| No trust prompt | Unlock, update iOS, reset Location & Privacy | Prompt returns; pairing completes |
| Trust prompt loops | Delete Lockdown files on computer | Fresh pairing state holds |
| Shows as “Unknown USB Device” | Reinstall Apple USB driver | Device lists as Portable Device |
| Works on one PC but not another | Security tool rules, driver level, ports | Adjust rules or reinstall components |
| Only charges on hubs | Use direct motherboard port, new cable | Data link stable |
| Mac sees it, iTunes doesn’t | Update or use Finder/Apple Devices app | Sync and backup options appear |
Step-By-Step Fix Flow
Step 1: Power Cycle
Reboot the handset and the computer. Many bugs clear after a fresh start.
Step 2: Fresh Cable And Direct Port
Swap to a short, data-capable cable and plug into a native USB port. Skip hubs during testing.
Step 3: Unlock, Trust, And Test
Unlock the handset, plug in, and press Trust. If the prompt never shows, reset Location & Privacy, then try again.
Step 4: Update Both Sides
Install iOS updates and pull the latest desktop app release. On Mac, use Finder or Apple Devices app. On Windows, use Microsoft Store or Apple’s installer.
Step 5: Repair Windows Drivers
Use Device Manager to remove the broken entry and let Windows reload the Apple Mobile Device USB driver. If needed, reinstall from the desktop app installer.
Step 6: Tame Security Tools
Grant full access to iTunes, Bonjour, and Apple Mobile Device Service in your firewall or antivirus. Then retest with the cable still connected directly.
Step 7: Clean Pairing Files
Delete the Lockdown folder contents on Windows or the /var/db/lockdown records on Mac. Approve trust again and verify that the device appears.
Step 8: Reinstall As A Last Resort
Uninstall the Apple desktop components in order, reboot, and install a fresh build.
When To Seek Hardware Service
If the handset never appears on any computer and other phones work on the same ports and cable, you may have a damaged connector or logic board line. At that point, a hardware inspection makes sense.