[6 Ways] Fix Unable to Complete Data Transfer iPhone 15/Plus/Pro/Max

Do you know how to do when you are unable to complete data transfer on iPhone 15 (Plus) /Pro (Max)? Find answers in this article and the easiest way is also listed to help you finish the iPhone-to-iPhone transfer efficiently.

Kathy by Kathy Updated March 4, 2024
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iPhone 15 Pro unable to complete data transfer.

Just transfer data from my old iPhone to my new iPhone 15 Pro, and this error keeps popping up, which makes me restart the whole process. I have tried charging both devices (both devices are on 80%+) but I am still getting the message. Please help!! Thank you!

- Question from Apple Community

Why unable to complete data transfer iPhone 15 (Plus) / Pro (Max)?

When you switch to a new iPhone 15, you may need to transfer data from old iPhone to your new iPhone. However, sometimes an error message "unable to complete data transfer" may appear during the transfer to stop the process. Why does this error occur?

update to transfer data

enlightenedYour iPhone doesn't have enough available storage space.
enlightenedA stable internet connection is essential for successful file transfers.
enlightenedThe low battery on your iPhone might not have enough power to complete the transfer.
enlightened Some file formats are not compatible with iOS devices.
enlightenedSoftware bugs or glitches can interfere with file transfers.

How to fix unable to complete data transfer iPhone 15 (Plus) / Pro (Max)

When the transfer process is interrupted by some unknown errors, you can find solutions below to solve your problem. Before the process, you should first charge both of your iPhones and make sure that there is enough space on your iPhone 15. (Go to Settings > General > Click iPhone Storage to check it.)

If you need a more convenient way to move all old iPhone data to your new iPhone 15, you can skip to the third part to finish the process quickly.

 🚩 View the video tutorial to fix the new iPhone 15 data transfer issue

Solution 1. Check the Internet connect

If the internet connection on your devices is too weak or unstable, you should switch to a new network. For people who use cellular data in the process, it’s better to change to a Wi-Fi network. You can also reset network settings to fix the issue. (Go to Settings on your iPhone > Tap General > Reset > Reset Network Settings.)

reset network settings

Will I lose any data when resetting the network?
No, it won't. This action only resets Wi-Fi networks, cellular settings, and VPN settings that you’ve used before but never erases any data.

Solution 2. Check the files’ format

Not all transferred file formats are compatible with iOS devices. Ensure that the files you're trying to transfer are in formats supported by your iPhone. You may need to convert or reformat files if necessary.

Solution 3. Force restart the old iPhone

You can also force restart both of your iPhones to troubleshoot the issue.

For iPhone 8 Plus/8/X or later: Press and release the Volume Up button > Press and release the Volume Down button > Press and hold the side button until the Apple logo appears.

restore iphone

For iPhone 7 Plus or 7: Press and hold the Sleep/Wake and Volume Down buttons simultaneously until the Apple logo appears.

For iPhone 6 or earlier: Press and hold the Home button and Sleep/Wake button at the same time until the Apple logo is displayed on your screen.

Solution 4. Reset your new iPhone 15

If your iPhone displays the error message, it often offers the option to reset the iPhone to initiate the setup process again. This can effectively solve the issue, but please be aware that it will erase all data on your iPhone.

Or you can go to the Settings app > General >Tap on Transfer or Reset iPhone > Choose Erase All Content and Settings and then confirm by selecting Continue. Follow the onscreen instructions to complete the reset process.

erase iphone

Solution 5. Enable Bluetooth on iPhones

Wireless data transfer relies on both Bluetooth and Wi-Fi, so it's crucial to ensure that both are enabled on your iPhones. Here are the steps to turn on Bluetooth on your iPhone.

Go to the Control Center (Open it by swiping down from the top of your iPhone screen. If you're using an iPhone 8 or earlier, swipe up from the bottom edge of the screen) > Look for the Bluetooth icon and toggle it on.

toggle on bluetooth

Solution 6. Update software on your iPhone

Updating your iPhone's operating system can often fix temporary bugs and issues appearing in the transfer process. Open the Settings app on your iPhone > Scroll down and select General > Choose Software Update > If an update is available, tap Download and Install.

update software on iPhone

Note: If your iPhone is unable to check for update, please find solutions to complete the update or use another way to transfer your iPhone data.

Hope these 6 ways can help you solve the “unable to complete data transfer iPhone 15” issue, if all ways above don't work, you can use the professional tool mentioned below to finish the iPhone-to-iPhone data transfer process.

The easiest way to transfer data from old iPhone to iPhone 15

If you want to choose another tool to help you move old iPhone data to your new iPhone after setup, you can use FoneTool to realize the process simply.

Its various features and advantages can provide you with a more efficient experience.

blushFast Transfer Speed: FoneTool can transfer thousands of photos within minutes while keeping the files in original image quality.
blushOne-Click Transfer Without Apple ID Limitation: FoneTool supports one-click iPhone-to-iPhone transfer after setup, even between different Apple IDs. 
blushUser-Friendly Interface: It allows you to complete the data transfer, backup, or restore tasks with just a few clicks.
blushUSB connection: The reliable USB connection protects iPhone data from any leakage risks. And the poor network connection won’t affect your transfer process anymore.
blushWide Compatibility: FoneTool works well with iPhone 4 to iPhone 15, as well as iOS 17. 

Step 1. Click the button to download the FoneTool on your PC > Connect both of your iPhones to the computer with two USB cables > If promoted, click Trust on your iPhone to continue.

Download Freeware Win 11/10/8.1/8/7/XP
Secure Download
enlightenedUsing FoneTool to finish the iPhone-to-iPhone transfer will wipe all data on your target iPhone, so it’s better to back up your important data to avoid data loss. (Go to Phone Backup > Choose Selective Backup)
enlightenedIf you have only one USB cable, you can go to Phone Backup > Choose Full Backup to back up all old iPhone data to PC. Then plug in your new iPhone and go to Backup History > Click Restore to move your data. Restoring full backup will also overwrite all data on your target iPhone.​​​​​

Step 2. Choose Phone Transfer > Go to iPhone to iPhone and click Get Started.

transfer from iphone to iphone

Step 3. Confirm the source device and the target device > Enable backup encryption > Click Start Transfer to begin the task.

start transfer

Once the process is completed, you can view all old iPhone data on your iPhone 15.

Tip: Next time if you need to move some contacts, photos, songs, etc. from iPhone to iPhone, you can also use Airdrop to finish the process.


That’s all about how to do when you are unable to complete data transfer iPhone 15. You can charge your iPhones and check the iPhone storage first. Then you can check the internet connection, check and convert the files’ format, force restart iPhone, reset your iPhone 15, enable Bluetooth or update software to fix this iPhone data transfer cancelled issue.

If you need to make an iPhone-to-iPhone transfer after setup, hope FoneTool can help you a lot. Once you have any queries or feedback, please feel free to contact us.

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