Q: I can't sync my phone to iTunes

See if these instructions are of help.

Sync your iPhone, iPad, or iPod touch with iTunes using USB - Apple Support

If not, you have to give us more detail on what is occurring when you try to sync. Is the iPhone recognized? Envy error messages? Etc.

Mmake sure your iTunes version is up to date. This is especially critical after updating to iOS 9.3.1.

If iTunes doesn't recognize your iPhone, iPad, or iPod - Apple Support

If your iOS device isn't showing in iTunes try the following:

1. Open Control Panel > Device Manager
2. Plug in your device
3. Locate Universal Serial Bus Controllers > Apple Mobile Device USB Driver.
   It is also possible the device may show under Imaging Devices, Portable Devices or Other Devices or as an MTB USB Device.
   
4. Right-click and select Update Driver Software...
5. Click Browse my computer for driver software
6. Browse to C:\Program Files\Common Files\Apple\Mobile Device Support\Drivers or
                   C:\Program Files (x86)\Common Files\Apple\Mobile Device Support\Drivers
7. Click Let me pick from a list of device drivers on my computer
8. Click Apple Mobile Device USB Driver
9. Click Next, then Close and exit Device Manager

For step 3 above, open the device manager. Expand any of these sections that are listed.

• Universal Serial Bus Controllers
• Imaging Devices
• Portable Devices
• Other Devices

Connect the device. You should hear the telltale sound of Windows device connection and one section should gain a new entry. That should be your device. It may not be labelled correctly at this stage. If you don't hear a noise suspect a damaged cable.

Or try If iTunes doesn‘t recognize your iPhone, iPad, or iPod - Apple Support

Failing that try a full tear down and rebuild of iTunes as set out in Troubleshooting issues with iTunes for Windows updates.

Or lastly try rolling back to the last build of iTunes that worked for you. See iTunes installers for download links. If you're rolling back from 12.3.3.17 to 12.3.2.35, for example, then you'll also need to roll back the database in the way described in Empty/corrupt iTunes library after upgrade/crash. The tip includes suggestions for reintroducing any recent purchases so at worst you lose a few playcounts and/or a recently created playlist.

tt2

Did you complete all of steps 1 through 9 and explicitly choose a new driver regardless of whether Windows claimed a suitable driver was already installed? If that still failed to work have you performed a complete tear down and rebuild of iTunes, and then run through steps 1 to 9 again if needed? If that failed have you installed the previous build of iTunes and tried again? Have you tried an alternate cable? Have you checked that your device appears properly on a different computer?

tt2

If you connect to another computer with iTunes running nothing should happen automatically. If you see this screen that should be enough to prove that the driver, cable, and software is all working properly on that computer.

If you have a 64-bit system installing the "for older video cards" version sometimes works.

You should run the iTunes installer as the administrator.

You should check that the Apple Mobile Device service is installed and can start if you ask it to.

tt2