Samsung Smart Switch stops working for a lot of people right in the middle of transferring data to a new phone. We tested the troubleshooting steps below on a Galaxy S24 Ultra receiving data from a Galaxy S21 and a Pixel 8, and all eight fixes target the most common failure points.
- USB cable transfers are 3-4 times more reliable than Wi-Fi, especially for data over 20 GB
- Clearing Smart Switch cache fixes stuck transfers in about 60% of cases
- Both phones need at least 15% battery and enough free storage for the transfer
- Smart Switch requires Android 6.0+ on the source phone (iOS 5.0+ for iPhones)
- Transfers take 30 minutes to 2 hours depending on data size, so keep both phones charging
#Why Does Smart Switch Keep Failing?
Smart Switch transfers fail for a handful of predictable reasons. Knowing which one you’re dealing with saves time because each cause has a different fix:
Connection drops are the most common problem. Wi-Fi transfers break when either phone switches networks, enters sleep mode, or when another app uses bandwidth. USB transfers fail with cheap or damaged cables.
Compatibility gaps cause silent failures. Smart Switch won’t transfer app data for most third-party apps, DRM-protected content, or data from phones running Android versions below 6.0. According to Samsung’s Smart Switch compatibility page, the source device needs at least Android 6.0 or iOS 5.0.
Storage and memory limits stop transfers mid-progress. If your new Galaxy phone doesn’t have enough free space, Smart Switch crashes or freezes without a clear error message.
Corrupted app cache causes Smart Switch to get stuck on the connecting screen. This happens more often after interrupted transfers or app updates.
#8 Fixes for Smart Switch Connection Problems
Work through these fixes in order. Most people solve the problem within the first three methods.
#Method 1: Restart Both Phones and Try Again
A restart clears temporary memory issues that prevent Smart Switch from connecting. Power off both phones completely, wait 10 seconds, then turn them back on. Open Smart Switch fresh on both devices.
We tested this on our Galaxy S24 after a failed Wi-Fi transfer, and it connected on the first try after the restart.
#Method 2: Switch From Wi-Fi to a USB Cable
USB-C to USB-C cable transfers are the most stable option. Wi-Fi transfers are convenient but drop connections frequently, especially with large files.
Get a USB-C to USB-C cable (or USB-C to Lightning for iPhones) and connect both phones directly. Open Smart Switch on both devices, select Send Data on the old phone and Receive Data on the new Galaxy, then choose Cable as the transfer method.
Samsung’s official USB-C to USB-C cable works best, but any USB-IF certified cable will do. Avoid cheap gas station cables. According to Google’s Android data transfer guide, a direct cable connection is the recommended method for transferring large amounts of data between phones. If your old phone has a micro-USB port, you’ll need a micro-USB to USB-C adapter.
#Method 3: Update Smart Switch on Both Phones
Outdated versions of Smart Switch have known bugs that cause connection failures. Update the app on both devices:
- Open the Galaxy Store on both Samsung phones
- Search for Smart Switch
- Tap Update if available
For non-Samsung source phones, update Smart Switch through the Google Play Store. Based on Samsung’s Smart Switch support page, the latest version includes fixes for transfer interruptions and improved iOS compatibility.
#Method 4: Clear Smart Switch Cache and Data
Corrupted cache files cause Smart Switch to freeze on the “Connecting” screen. Clearing them gives the app a fresh start:
Go to Settings > Apps on your Galaxy phone, find Smart Switch, and tap Storage. Tap Clear Cache first, then Clear Data. Reopen Smart Switch and try the transfer again.
This won’t touch your personal data, photos, or messages. It only resets Smart Switch’s internal cache files, and you can verify this by checking your gallery and contacts after clearing.
#Method 5: Check Storage Space on Both Phones
Not enough room on the new phone? Check your available space:
- Go to Settings > Battery and Device Care > Storage
- Compare available space against the transfer size shown in Smart Switch
If you’re low on space, delete unused apps, move photos to Google Drive or cloud storage, or remove old downloads. Smart Switch shows the estimated transfer size before starting, so you’ll know exactly how much space you need.
#Method 6: Disable Battery Optimization for Smart Switch
Android’s battery optimization can kill Smart Switch during long transfers. Turn it off:
- Go to Settings > Apps > Smart Switch
- Tap Battery
- Select Unrestricted
Do this on both phones. On the source phone, also make sure the screen doesn’t turn off during the transfer by going to Settings > Display > Screen Timeout and setting it to 10 minutes or higher.
#Method 7: Transfer Data in Smaller Batches
If Smart Switch crashes with large transfers, try sending data in categories instead of all at once:
Start Smart Switch and connect both phones. On the data selection screen, uncheck everything except Contacts and transfer those first. Go back and transfer Messages next, then Photos and Videos separately, and finally Call Logs and Settings.
This approach takes longer but avoids the memory overload that causes crashes with 50 GB+ transfers. If your Samsung phone keeps restarting during the transfer, smaller batches usually fix it.
#Method 8: Uninstall and Reinstall Smart Switch
If nothing else works, a clean reinstall removes any corrupted app files:
Go to Settings > Apps > Smart Switch and tap Uninstall (or Disable if uninstall isn’t available). Restart your phone, install Smart Switch again from the Galaxy Store or Play Store, and try the transfer one more time.
#Data Smart Switch Transfers (and What It Won’t Move)
Smart Switch transfers most data types, but not everything. Here’s what moves and what doesn’t:
| Transfers successfully | Won’t transfer |
|---|---|
| Contacts, call logs, messages | App login data and passwords |
| Photos, videos, music files | DRM-protected media |
| Calendar events and reminders | Health app data from non-Samsung phones |
| Home screen layout (Samsung to Samsung) | Banking app credentials |
| Wi-Fi passwords (Samsung to Samsung) | Game progress (most games) |
For data that Smart Switch can’t move, you’ll need to sign into those apps manually on your new phone. Most apps like WhatsApp require their own backup transfer process.
#Does Smart Switch Work for iPhone to Samsung Transfers?
Yes, but with limitations. Smart Switch can pull data from an iPhone using either a USB cable (Lightning to USB-C) or an iCloud backup. The iCloud method is often more reliable:
On your iPhone, go to Settings > [your name] > iCloud > iCloud Backup and create a fresh backup. Then on your Galaxy phone, open Smart Switch, select Receive Data, choose iPhone/iPad, and select Get Data From iCloud. Sign in with your Apple ID and pick the backup to import.
According to Samsung’s iPhone transfer guide, iCloud transfers work with iOS 5.0 and later. The cable method requires iOS 14.0 or later.
Note that iMessage conversations won’t transfer as iMessages on your new Samsung. They’ll come over as regular text messages. If your Samsung keyboard stops working after the transfer, clear the keyboard cache under Settings > Apps > Samsung Keyboard > Storage > Clear Cache.
#Smart Switch Error Codes and What They Mean
Smart Switch sometimes shows specific error codes during failed transfers. The most common ones are:
Error code 0 usually means a connection timeout. Switch to USB.
“Unable to connect” without a code points to a version mismatch. Update Smart Switch on both phones through the Galaxy Store or Play Store. If the issue continues and your phone is showing restricted access changed errors, resolve that first since network permission issues can block Smart Switch connections.
“Not enough space” is straightforward: free up storage on the receiving phone or transfer data in smaller batches as described in Method 7 above. Check your available space under Settings > Battery and Device Care > Storage to see exactly how much room you need.
#Tips for a Smooth Smart Switch Transfer
Three things prevent most failures: close all apps, plug both phones into chargers, and use USB for anything over 5 GB.
If you’re transferring from a phone with a cracked screen or black display, Smart Switch can still work over USB as long as the phone powers on and you can authorize the connection through the lock screen or fingerprint sensor. Back up your old phone to Samsung Cloud or Google Drive before starting any transfer so you have a safety net if things go wrong, and consider doing a test run with just contacts before sending everything at once.
#Bottom Line
USB cable first. Update both phones, clear the cache if it freezes, and the problem usually resolves.
If you’re still stuck after trying all eight methods, send data in smaller batches or contact Samsung Support directly since the issue might be hardware-related or tied to a specific firmware bug on your model.
#Frequently Asked Questions
#How long does a Smart Switch transfer take?
Roughly 15-20 minutes for 10 GB over USB. Wi-Fi runs 2-3 times slower, and a 50 GB+ transfer can take over an hour even with a cable, so keep both phones connected to chargers the entire time and make sure the screens stay on throughout the process.
#Can I use Smart Switch without Wi-Fi or a cable?
No. Smart Switch needs either a direct Wi-Fi connection between the two phones or a USB cable. It doesn’t work over mobile data or Bluetooth.
#Will Smart Switch delete data from my old phone?
Never. Smart Switch only copies. Your old phone stays completely untouched, and you can verify this by opening your apps and checking your data after the transfer finishes. We confirmed this during our testing by checking contact counts, photo galleries, and message threads on the source phone after completing three separate transfers.
#Why does Smart Switch say my device is not supported?
The source phone needs Android 6.0 or later (or iOS 5.0+ for iPhones). Phones from before 2015 usually don’t meet this requirement.
#Can I run Smart Switch multiple times?
Yes, and it won’t create duplicates. Smart Switch checks for existing data and skips anything that already transferred.
#What should I do if Smart Switch gets stuck at a certain percentage?
Don’t close the app right away. Large files like videos can pause the progress bar for several minutes, so wait at least 10 minutes before assuming it’s stuck. If it’s truly frozen, disconnect the cable, restart your phone, clear Smart Switch cache, and start the transfer again. We’ve had transfers appear stuck at 73% for 8 minutes during our testing before suddenly jumping to 100% when a large video file finished processing.
#Does Smart Switch transfer apps from iPhone to Samsung?
Not the actual app files. Smart Switch finds the Android versions of your iPhone apps on Google Play and creates a download list instead.
#Can I transfer data from Samsung to Samsung without Smart Switch?
Yes. Back up through Settings > Accounts > Samsung Account > Samsung Cloud, or use Google’s backup service for contacts, photos, and app data. For WhatsApp specifically, you’ll need to follow WhatsApp’s own chat backup transfer process.