Computer not recognizing your iPhone? What to check, in order

TwinHop team · Updated October 20, 2026

Start with the cable: use one that carries data and plug it straight into the computer. Then unlock the iPhone and tap “Trust”. On Windows, install Apple Devices and restart. These three checks solve almost every case. Go through the list below in order and stop when the phone appears.

1. The cable and the port

• Use a cable that carries data. Many cables only charge: the phone charges, the computer sees nothing. If you have another cable, try it first, ideally the one that came with an iPhone.
• Plug straight into the computer. No USB hubs, adapters, extension cables or monitor ports. A hub that is fine for a mouse can break a long backup.
• Try another port, especially on desktop PCs: the ports at the back are usually more reliable than the ones on the front.

In one case we looked into, the phone disappeared after every restart during a transfer. Another cable fixed it, and the move went through.

2. Unlock and trust

• Unlock the iPhone and keep it on the Home Screen while you connect.
• Tap “Trust” on the “Trust This Computer?” alert and enter the passcode.
• No alert? Unplug the cable and plug it in again with the phone unlocked. The alert appears only after you connect.
• If the phone was restored or apps were reinstalled, it may ask to trust the computer again. That is normal: confirm once more.

3. On Windows: the Apple service

Windows needs Apple’s own driver and service to talk to an iPhone. They come with the Apple Devices app from the Microsoft Store (or with iTunes).

• If neither is installed, install Apple Devices and restart the computer.
• If it is installed, open it once: this starts the Apple service. Then close it again.
• Still nothing? Open “Services” in Windows, find Apple Mobile Device Service and restart it.

Apple Devices and iTunes can also start their own backup when you connect the phone. While they do, the phone is busy and doesn’t answer other programs. If TwinHop says the phone didn’t respond, close Apple Devices or iTunes, restart the iPhone and try again.

4. Use the readiness check

In TwinHop, click “Check readiness”. It goes through the same points as this list: whether the phone is connected, whether the Apple service answers, whether the phone trusts this computer and whether it is unlocked. Each point gets a mark. Fix the marked ones and click “Check again”.

5. The connection drops during a long backup

The phone was found, but the backup or the restore breaks off halfway:

• The phone locked itself or went to sleep. Keep it unlocked; on the phone, you can temporarily set Settings → Display & Brightness → Auto-Lock to “Never”.
• The backup is waiting. If progress stands still, look at the phone: it may be asking for the passcode.
• USB power saving on Windows. Windows can switch off a USB port to save power. In Device Manager, open “Universal Serial Bus controllers”, then each “USB Root Hub”, and on the “Power Management” tab clear “Allow the computer to turn off this device to save power”.
• The computer went to sleep. TwinHop keeps it awake during a transfer, but a laptop that runs out of battery will still stop. Keep it plugged in.

6. Reset trust from the computer’s side

If the phone shows up on another computer but not on yours, or “Trust” never appears however often you reconnect, the trust record for this phone on your computer is out of date. While it is there, the phone won’t ask again.

• Windows. Close TwinHop and Apple Devices and unplug the phone. Press Win+R, paste %ProgramData%\Apple\Lockdown and press Enter. Delete only this phone’s file: its name starts with the device ID (for example 00008150-…) and ends in .plist. Leave SystemConfiguration alone and don’t delete everything. Connect the phone, unlock it, tap “Trust”, enter the passcode, then open TwinHop.
• Mac. Restart the Mac and the iPhone, connect the cable, unlock the phone and tap “Trust”. If the question still doesn’t appear, write to us (below).

Don’t reset “Location & Privacy” on the iPhone for this. It wipes the phone’s list of trusted computers while the record on the computer stays, and a phone that used to work stops answering too.

7. Still not working

Apple’s checklist for the same problem is If your computer doesn’t recognize your iPhone or iPad.

Write to us at support@twinhop.com and attach the log: in TwinHop, click “Log…”. Tell us which computer and iPhone you use and what you have already tried from this list. That saves a round of questions.