When moving from an old Android phone to a new Android phone, the built-in Copy Apps & Data, Google restore process, Samsung Smart Switch, or another manufacturer's migration utility can sometimes become stuck at a particular percentage or remain on messages such as:

• Copying your data…
• Preparing to copy…
• Connecting to your old device…
• Transferring data…
• Calculating time remaining…
• Restoring apps…
• Finishing setup…
• Waiting for old device…
• 0% / 50% / 99% complete

A transfer that appears frozen does not necessarily mean your data is damaged. Large transfers can legitimately take a long time, but a transfer that shows no meaningful progress for an extended period may indicate a connection, storage, cable, application, permission, battery, or software problem.

This technical guide explains why Android old-phone-to-new-phone transfer gets stuck, how to troubleshoot it safely, and what alternative methods can be used when the normal transfer process repeatedly fails.

1. How Android Phone-to-Phone Transfer Works

During the initial setup of a new Android device, Android normally offers an option to copy apps and data from an existing phone.

Depending on the devices involved, the transfer may use:

1. USB-C to USB-C cable
2. USB cable with an OTG adapter
3. Wi-Fi / Wi-Fi Direct
4. Google cloud backup
5. Manufacturer migration software
6. Computer backup and restore

Google supports both cable and wireless methods for transferring data between Android devices. Google recommends signing in with the same Google Account to obtain a more complete transfer.

Samsung Galaxy devices additionally provide Smart Switch, which supports wireless, USB cable, computer backup and other migration methods.

2. Is the Transfer Really Stuck?

Before cancelling the transfer, determine whether it has actually stopped.

A phone containing:

• thousands of photographs,
• hundreds of videos,
• WhatsApp media,
• large application libraries,
• documents,
• music,
• SMS messages,
• call history,

may require considerable time.

Google notes that copying Android data can take from a few minutes to more than an hour, depending on the amount of data being transferred.

Therefore, a percentage remaining unchanged for several minutes does not automatically mean the process has failed.

Signs that it may genuinely be stuck

The transfer deserves investigation when:

• percentage remains unchanged for a long time;
• estimated time never changes;
• one phone says connected while the other says disconnected;
• transfer repeatedly returns to the same percentage;
• an error repeatedly appears;
• the phones become disconnected;
• the transfer application crashes;
• Wi-Fi disconnects repeatedly;
• USB connection repeatedly reconnects;
• the process stops whenever the screen locks;
• storage on the destination phone becomes full.

Google specifically advises that if Android setup transfer remains stuck for more than 15 minutes, the user can stop copying and then check what data successfully transferred.

3. Common Reasons Android Phone Transfer Gets Stuck

Reason 1: Unstable Wireless Connection

Wireless migration requires a reliable connection between the devices.

Problems may occur because of:

• weak Wi-Fi;
• phones being too far apart;
• Wi-Fi switching between networks;
• VPN applications;
• hotspot interference;
• battery optimization;
• temporary wireless driver problems.

Samsung recommends keeping the devices close together and keeping Wi-Fi enabled throughout a wireless Smart Switch transfer.

Solution

Place both phones next to each other.

Temporarily disable:

• VPN
• Battery Saver
• Ultra Power Saving
• Wi-Fi switching features
• Mobile hotspot

Restart both devices and retry.

4. Insufficient Storage on the New Phone

This is one of the most important things to check.

Suppose the old phone contains:

145 GB of transferable data

but the new phone has only:

120 GB available storage

The migration cannot complete successfully.

Even when the figures appear close, additional free space may be required for Android, temporary files, application installation and processing.

Samsung specifically identifies insufficient destination storage as a reason Smart Switch wireless transfers can fail.

Check storage

On the new Android phone, normally open:

Settings → Storage

or:

Settings → Battery and device care → Storage

depending on the manufacturer.

Compare available storage with the estimated transfer size.

Solution

Transfer fewer categories.

For example, first transfer:

• Contacts
• Messages
• Call logs
• Settings
• Documents

Then separately handle:

• Photos
• Videos
• Music
• Large applications

5. USB Cable Problem

A cable that successfully charges a phone does not necessarily provide reliable data transfer.

Some inexpensive USB cables are:

• charging-only cables;
• damaged internally;
• USB 2.0 cables with poor connectors;
• unable to maintain stable data communication.

Symptoms

You may see:

• Connecting…
• Device disconnected
• Try another cable
• Transfer interrupted
• USB device reconnecting
• transfer stopping randomly

Solution

Prefer:

• the original phone cable;
• a certified USB data cable;
• USB-C to USB-C data cable;
• a high-quality OTG adapter if necessary.

Avoid loose adapters and unnecessarily long cables.

Google recommends checking or replacing the cable when nothing happens after connecting the devices or Android reports a cable problem.

6. Battery Is Too Low

Phone migration can consume significant battery power.

Samsung warns that data transfer increases battery consumption and a transfer can be interrupted if battery power becomes too low.

Recommended preparation

Before starting:

Old phone: preferably 70–100%

New phone: preferably 70–100%

If wireless transfer is being used, both phones can generally remain connected to their chargers.

7. Restart Both Phones

Temporary Android services occasionally become stuck during device discovery or transfer.

Restart:

1. Old phone
2. New phone
3. Wi-Fi router if normal Wi-Fi is involved

Samsung also recommends restarting both devices when Smart Switch cannot establish the required connection.

After restarting, try the transfer again.

8. Update Android and Transfer Applications

Before another attempt, check for updates.

Android update

Usually:

Settings → System → Software Update

or:

Settings → Software Update

Google Play updates

Open:

Google Play Store → Profile → Manage apps & device → Update all

If using Samsung:

Update Smart Switch on both phones.

An old transfer utility on one device and a newer version on another may cause compatibility problems.

9. Samsung Smart Switch Stuck

Samsung Galaxy users commonly transfer phones through Smart Switch.

Smart Switch supports transfer using:

• Wi-Fi
• USB
• PC/Mac backup

and can move items including contacts, messages, photographs, videos, music, documents and various settings, subject to device and OS restrictions.

If Smart Switch repeatedly freezes, try the following sequence.

Step 1 — Restart both phones

Restart both devices.

Step 2 — Update Smart Switch

Ensure both phones are running current compatible versions.

Step 3 — Check available storage

Confirm the destination device has enough free space.

Step 4 — Transfer fewer categories

Instead of selecting Everything, try:

Contacts + Messages

then:

Photos

then:

Videos

then:

Documents

then:

Apps

Samsung specifically recommends deselecting everything and transferring selected content when wireless Smart Switch transfer fails.

Step 5 — Clear Smart Switch cache

On many Samsung devices:

Settings → Apps → Smart Switch → Storage → Clear cache

Samsung lists clearing Smart Switch cache as a troubleshooting step when a transfer does not complete.

Step 6 — Switch from wireless to cable

If wireless migration repeatedly fails, use USB.

Samsung specifically recommends cable transfer as an alternative when wireless transfer continues to fail.

10. Transfer Gets Stuck at 99%

A transfer freezing at 99% is particularly confusing.

It does not necessarily mean the remaining 1% represents only 1% of the work.

The phone may be:

• finalizing databases;
• processing media;
• restoring settings;
• installing applications;
• verifying files;
• indexing photographs;
• completing background tasks.

Therefore, allow additional time before forcing a restart.

If there is still no progress after an extended period, cancel carefully and determine which data already transferred.

11. Apps Are Still Installing After Transfer

Another common misunderstanding occurs when the phone migration reports completion but application icons remain grey or unavailable.

Application installation can continue in the background after the main transfer process finishes.

Samsung notes that application installation may continue after Smart Switch itself has finished.

Check:

Play Store → Manage apps & device

and the notification panel for ongoing installation activity.

Leave the new phone:

• connected to Wi-Fi;
• connected to its charger;
• powered on for some time.

12. WhatsApp Requires Special Attention

Do not assume that the general Android phone-transfer process is your only protection for WhatsApp.

Before changing phones, verify your WhatsApp backup.

Normally:

WhatsApp → Settings → Chats → Chat backup

Confirm:

• correct Google Account;
• recent backup date;
• videos included if required;
• backup successfully completed.

Google notes that WhatsApp chats and data can be restored from the cloud after signing in and opening WhatsApp on the new Android phone, provided WhatsApp backup was enabled on the old device.

Do not erase the old phone until WhatsApp history and important media have been verified on the new device.

13. Some Data May Not Transfer

Even a successful Android migration does not guarantee that absolutely everything will be duplicated.

Google identifies several categories that may not transfer through standard Android migration, including some application data, non-Google accounts and their data, certain settings and data belonging to applications that do not use Android backup.

You may need to configure certain applications manually.

Examples include:

• banking applications;
• payment applications;
• corporate applications;
• authenticator applications;
• security applications;
• VPN applications;
• some email accounts;
• some game data;
• DRM-protected content.

14. Be Extremely Careful with Authenticator Applications

This is one of the most important precautions when changing phones.

Before resetting your old phone, check applications such as:

• Google Authenticator
• Microsoft Authenticator
• other OTP authenticators
• banking token applications
• business authentication applications

Do not assume their authentication credentials will automatically transfer like photographs.

Verify that every important account can generate valid codes from the new phone before wiping the old phone.

Also preserve account recovery codes where available.

15. Google Account Backup as an Alternative

If direct phone-to-phone transfer keeps failing, Google backup can provide another recovery route.

Depending on device, Android version and backup configuration, Google backup may contain items such as:

• applications and some app data;
• contacts;
• call history;
• device settings;
• SMS/MMS;
• other supported information.

Google supports restoring a previous device backup associated with the user's Google Account during new-device setup.

Before relying on it, verify that the old phone has successfully completed its latest backup.

16. Transfer Photos Separately

If the phone contains 50–200 GB of photographs and videos, consider excluding them from the initial migration.

Instead use:

Option A — Google Photos

Back up photographs from the old phone and verify them in Google Photos.

Option B — Computer

Connect the old phone to a Windows PC and copy folders such as:

DCIM

Pictures

Movies

Download

and any other important media folders.

After the new phone is configured, copy the required files to it.

Option C — Manufacturer backup software

For example, Samsung Smart Switch can back up supported data to a computer and later restore it to a Galaxy phone.

This can be particularly useful when wireless phone-to-phone migration repeatedly fails.

17. Transfer Data in Smaller Batches

When a 100+ GB migration repeatedly fails, divide it into smaller transfers.

For example:

Transfer 1

Contacts + SMS + Call history

Transfer 2

Documents

Transfer 3

Photos

Transfer 4

Videos

Transfer 5

Music

Transfer 6

Apps

This can also help identify the problematic category.

For example:

Everything together → fails at 72%

Photos only → completes

Videos only → completes

Apps → fails

You now know that the application migration is likely causing the problem.

18. Check for a Corrupted File

Occasionally a damaged:

• video;
• photo;
• archive;
• database;
• download;
• application data file

can interfere with a transfer.

If the migration always stops around approximately the same point, transferring data category-by-category can help isolate the problematic content.

19. Disable Battery Optimization Temporarily

Android manufacturers aggressively manage background applications to conserve battery.

During migration, temporarily disable:

• Battery Saver
• Ultra Power Saving
• Adaptive battery restrictions for the transfer app, if applicable

Keep both phone screens accessible and periodically check the transfer status.

Re-enable normal battery settings after migration.

20. Avoid Using the Phones During Migration

While transferring a large amount of data, avoid:

• recording video;
• downloading large files;
• gaming;
• restarting either device;
• making unnecessary configuration changes;
• disconnecting the cable;
• switching Wi-Fi networks;
• clearing application data;
• removing storage media.

Allow the migration process to finish without unnecessary interference.

21. What If the Transfer Stops Halfway?

Suppose the process stops at:

67%

Do not immediately factory-reset the old phone.

First determine what already reached the new device.

Check:

• Contacts
• Messages
• Photos
• Videos
• Documents
• Downloads
• Applications
• WhatsApp
• Calendar
• Notes
• Call logs

Then restart the transfer and select only the missing categories where the migration utility permits it.

22. Should You Factory Reset the New Phone?

Not immediately.

Factory reset should normally be considered only after simpler troubleshooting has failed.

Try first:

1. Restart both phones.
2. Charge both phones.
3. Verify storage.
4. Update Android.
5. Update the migration application.
6. Retry with fewer data categories.
7. Switch wireless → USB.
8. Try Google backup restore.
9. Try computer backup/restore.

Only then consider resetting the new phone and restarting its initial setup.

Google notes that in some circumstances where transfer cannot be restarted from Settings, factory-resetting the new device and retrying setup may be necessary.

Do not factory-reset the old phone merely because migration failed.

23. Recommended Troubleshooting Sequence

For an Android-to-Android transfer that is currently stuck, use this order:

Step 1: Wait long enough to confirm it is genuinely stuck.

Step 2: Verify the old phone still contains all original data.

Step 3: Check free storage on the new phone.

Step 4: Charge both devices.

Step 5: Restart both phones if the transfer has clearly failed.

Step 6: Update Android and the transfer application.

Step 7: Retry the transfer.

Step 8: Transfer fewer categories.

Step 9: If wireless fails, use a USB data cable.

Step 10: If direct transfer continues failing, use Google backup or manufacturer backup.

Step 11: Manually copy large photos/videos using a computer where appropriate.

Step 12: Verify everything before resetting or trading in the old phone.

24. Critical Data Verification Before Erasing the Old Phone

Never wipe, sell, exchange or factory-reset your old phone immediately after the new phone displays Transfer Complete.

Verify important information first.

Check at minimum:

Data	Verification
Contacts	Open Contacts and search several people
Photos	Check old and recent photographs
Videos	Play several large videos
WhatsApp	Check chats and media
SMS	Open recent and older messages
Call history	Verify recent calls
Documents	Open PDFs, Office files and downloads
Notes	Check important notes
Calendar	Check future appointments
Email	Confirm all accounts
Banking apps	Confirm login/access
Authenticator	Test authentication codes
Google Account	Confirm synchronization
Password manager	Confirm access
Files	Compare important folders

For business users, also check any:

• accounting applications;
• customer databases;
• digital certificates;
• VPN configurations;
• remote-access applications;
• business email;
• authenticator credentials;
• locally stored documents.

25. Recommended Safe Migration Strategy

For users with important business or personal data, the safest strategy is not to depend on a single transfer mechanism.

Use a layered approach:

Old Android Phone

↓

Google Backup

•  

Phone-to-Phone Transfer

•  

WhatsApp Backup / Transfer

•  

Google Photos or Manual Photo Backup

•  

PC Backup of Critical Files

↓

New Android Phone

↓

Verify Everything

↓

Keep Old Phone Unchanged for Several Days

↓

Factory Reset Old Phone Only After Verification

This significantly reduces the possibility of discovering missing information after the old phone has already been erased.

26. Important Warning

Never factory-reset your old Android phone simply because the transfer is stuck.

Your old phone is currently the primary copy of information that may not yet exist anywhere else.

Before deleting anything, make sure important information exists in at least one additional verified location.

For highly important business or personal data, preferably maintain two independent backups before wiping the old device.

27. Frequently Asked Questions (FAQ)

Q1. Why is my Android phone transfer stuck?

Common causes include unstable wireless connectivity, insufficient storage, faulty USB cables, low battery, software bugs, incompatible transfer applications or problematic files.

Q2. How long should Android data transfer take?

It depends on the amount of data and transfer method. Google states that copying can take anywhere from a few minutes to over an hour. Very large media libraries can take considerably longer in real-world conditions.

Q3. My transfer has been stuck at 99%. Should I restart the phone?

Not immediately. The device may be finalizing applications, media databases or settings. Give it additional time. Restart only when it is clear that the process has stopped responding.

Q4. Can I stop Android transfer and start again?

Usually yes. Google indicates that transfers interrupted by power or disconnection can generally be restarted.

Q5. Is cable transfer better than wireless transfer?

Both are officially supported. A good USB data cable can be preferable when wireless transfer repeatedly disconnects or fails.

Q6. Why does my phone charge through the cable but not transfer data?

The cable may be charging-only, damaged or unsuitable for reliable data communication. Try the original or another certified data-capable cable.

Q7. Can insufficient storage cause Smart Switch to freeze?

Yes. Samsung specifically identifies insufficient free storage as a cause of Smart Switch wireless transfer failure.

Q8. Should I delete data from my old phone to make the transfer work?

Generally no. First create and verify backups. If the destination lacks capacity, exclude unnecessary categories from the transfer rather than deleting the only existing copy.

Q9. Why are apps grey after Smart Switch finishes?

Application installation can continue in the background after Smart Switch completes its main transfer.

Q10. Will WhatsApp automatically transfer?

Do not assume it will. Verify WhatsApp's own backup/transfer process before erasing the old phone.

Q11. Can Google backup restore my phone if direct transfer fails?

Yes, supported data from a previous Android backup associated with your Google Account can be restored during setup.

Q12. Does every app transfer its login password?

No. Many applications require you to sign in again, particularly financial, security and enterprise applications.

Q13. Will banking apps transfer completely?

The application may reinstall, but banking apps commonly require new-device verification, OTP authentication, SIM verification or another activation process.

Q14. What should I do about Google Authenticator?

Verify that your authenticator accounts have been successfully transferred or otherwise recovered on the new phone before resetting the old device.

Q15. Can I transfer photos separately?

Yes. Google Photos, a computer, USB storage or supported manufacturer software can be used instead of including a very large photo library in the initial phone migration.

Q16. Why does transfer always stop at the same percentage?

A particular data category, application or problematic file may be involved. Try transferring categories individually to isolate the cause.

Q17. Should both phones be connected to chargers?

It is recommended when practical, especially for a large wireless transfer.

Q18. Can I use my phone while data is transferring?

Basic use may sometimes be possible, but avoiding unnecessary activity is safer during a large migration.

Q19. Should I factory-reset my new phone if transfer fails?

Only after simpler troubleshooting has failed. Resetting the new phone can sometimes restart the initial migration workflow, but ensure there is nothing unique on the new device first.

Q20. When should I erase my old Android phone?

Only after verifying contacts, photographs, videos, WhatsApp, messages, documents, authenticator accounts, banking access and other critical information on the new device or in a confirmed backup.

 

Conclusion

An Android old-phone-to-new-phone transfer getting stuck is usually recoverable and does not mean that the data on the old phone has been lost.

The most important rule is simple:

Do not erase the old phone until the new phone has been completely checked.

When a transfer repeatedly fails, troubleshoot systematically: check available storage and battery, restart and update both phones, transfer smaller categories, replace wireless transfer with a reliable USB data cable, and use Google or manufacturer backup methods when necessary.

For critical data, use more than one backup method and verify the restored information before factory-resetting, selling, exchanging or recycling the old device.

Disclaimer

The menus, capabilities and transfer procedures described in this article may differ according to Android version, device manufacturer, phone model, application version and regional configuration. Always maintain a verified backup of important information before performing a factory reset or deleting data. This article is provided for technical education and general troubleshooting purposes.

 

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