Synchronizing two smartphones on Android is a task that millions of users face when purchasing a new device, working together, or backing up. However, not everyone knows that there are at least five synchronization options, and each of them is optimal for specific purposes. Someone wants to transfer only contacts and photos, someone needs a complete mirror copy of settings, and others are looking for a way to automatically update files between devices in real time.

In this article we will analyze all the current methods - from standard functions Google Account to specialized applications like Syncthing or Send Anywhere. You will learn how to avoid common mistakes (for example, duplicate contacts or data loss during transfer), what settings affect synchronization speed, and what to do if devices do not “see” each other. And for those who work with large volumes of data, we have prepared a comparative table of methods indicating limitations on volume and speed.

1. Synchronization via Google Account: basic method for contacts and calendars

The simplest and most universal way is to use the built-in capabilities Google Account. This method does not require the installation of additional applications and works on all devices with Android 5.0 and newer. The main advantage: data is automatically updated on both smartphones when connected to the Internet, and the history of changes is saved in the cloud.

What exactly can be synchronized through Google:

  • 📇 Contacts (including groups and tags)
  • 📅 Calendars and events (with reminders)
  • 📝 Notes from Google Keep
  • 📍 Data from Google Maps (saved places, visit history)
  • 🔧 Some system settings (Wi-Fi passwords, language preferences)

To activate synchronization, go to Settings → Accounts → Google → Account synchronization on both devices and turn on the switches opposite the desired categories. Please note: for photos and video you will need to configure separately Google Photos (more on this in the next section).

⚠️ Attention: If another account was previously used on one of the devices Google, before synchronizing, delete it or transfer the data manually. Otherwise, contacts and calendars may be duplicated.
📊 How often do you synchronize data between devices?
Daily
Once a week
Only when buying a new phone
Never synchronized

2. Transferring Photos and Videos: Google Photos vs. local network

For synchronization multimedia files users have two fundamentally different approaches: cloud (via Google Photos) and local (via Wi-Fi or cable). The first method is convenient for automation, but has limitations on free storage (15 GB per account), the second is faster and does not depend on the Internet, but requires manual control.

Let's compare both options:

Criterion Google Photos Local network (Wi-Fi Direct, FTP)
Max. free volume 15 GB (total with Gmail and Drive) Limited by device memory
Transfer speed Depends on the Internet connection Up to 10–50 MB/s (via Wi-Fi 5/6)
Automatic update Yes (with backup enabled) No (must be started manually)
File compression Yes (if you select "High quality") No

To configure Google Photos open the application on both devices, go to Settings → Backup and synchronization and enable the option Select the download quality ("Original" or "High") and wait for the first one to complete. It is convenient to organize local transfer through applications like Feem or Portal by Pushbullet - they create a temporary Wi-Fi network between devices.

💡

If you need transfer photos with maximum quality, but without the cloud, use a cable USB OTG and a file manager (for example, Solid Explorer). The transfer speed will be 2-3 times higher than via Wi-Fi.

3. Full synchronization of settings and applications: Mi Mover, Smart Switch and analogues

When you need to transfer not only data, but system settings, applications with their cache, as well SMS/MMS, manufacturers' proprietary utilities come to the rescue. For example, for devices Samsung this is Smart Switch, for Xiaomi — Mi Mover, for Huawei — Phone Clone. These tools copy almost everything, including:

  • 📱 Installed applications (preserving data where possible)
  • 📄 Wi-Fi, Bluetooth, wallpaper and theme settings registration
  • 💬 Message history (SMS, MMS, sometimes instant messenger chats)
  • 🔊 Calls and call log

The transfer process usually takes 10-30 minutes and takes place in several stages:

  1. Install the utility on both devices (available in Play Market or pre-installed).
  2. On the old phone, select the "Send" mode, on the new one - "Receive".
  3. Connect the devices via cable or Wi-Fi (depending on the app).
  4. Select categories of data to transfer and confirm the start of the process.
⚠️ Attention: When transferring applications, some data (for example, saves in games or authorization in banking applications) may not be transferred due to security restrictions. Before you begin, check whether the application you need supports backup.

Download both devices to 100%|Connect to the same Wi-Fi network (if using the wireless method)|Close all background applications|Check the free space on the new device (must be 1.5 times the amount of data transferred)-->

4. Real-time synchronization: Syncthing and Resilio Sync

If you need continuous synchronization files between devices (for example, for document collaboration or automatic backup), standard methods will not work. Specialized applications like Syncthing (open source) or Resilio Sync (proprietary solution) will help here. Their key features:

  • 🔄 Synchronization works on the P2P principle (without cloud servers).
  • 🔒 Data is encrypted during transmission (in Syncthing - using TLS).
  • 📂 You can selectively synchronize folders (for example, only Download or DCIM/Camera).
  • 📱 Works in the background and updates files whenever changes occur.

To configure Syncthing:

  1. Install the application on both devices from Play Market or official website.
  2. On the first device, create a new folder for synchronization and generate Device ID.
  3. On the second device, add the first one as "remote" (enter it ID and the IP address in the local network).
  4. Select folders for exchange and synchronization direction (one-way or two-way).

Syncthing has no restrictions on the amount of data and does not require registration, but for stable operation both devices must be on the same network or have access to the Internet through a relay server.

What to do if Syncthing does not see the second one device?

1. Check that both devices are connected to the same Wi-Fi network (or enable a mobile hotspot on one of them).

2. In the settings Syncthing on both phones, go to Actions → Show ID and compare Device ID —they must match in the list of trusted ones.

3. Disable the firewall or VPN if they are active.

4. Try connecting via the IP address manually (find it in the Wi-Fi settings on the second one). device).

5. Alternative methods: Bluetooth, NFC and cloud services

To transfer small files or quickly synchronize individual elements (for example, one contact or photo), alternative methods are suitable. They are less universal, but sometimes they turn out to be the only way out - for example, if devices do not have access to Wi-Fi or cable.

Let's consider the pros and cons of each:

Method Pros Cons Max. speed
Bluetooth Does not require Internet, low power consumption Very slow (up to 2–3 MB/s), file size limitation ~2 MB/s
NFC Instant transfer of links or small files Works only at a distance of up to 4 cm, maximum 1–2 MB ~0.5 MB/s
Cloud (Dropbox, Yandex Disk) Access from any device, file version Limitation of free space, dependence on the Internet Depends on the network
QR code (applications like Snapdrop) Quick setup, no need for accounts Requires connection to the same network ~5–10 MB/s

To transfer via Bluetooth activate it on both devices, find the second device in the list of available ones and confirm pairing. To send the file, select it in the gallery or file manager, click "Share" and select Bluetooth. To NFC turn on the module in the settings (Wireless networks → NFC), bring the devices close to each other and wait for vibration.

6. Solving problems: why devices do not synchronize

Even with proper settings, synchronization may fail. Here are the most common reasons and solutions:

  • 🔌 No Internet connection: Check mobile data or Wi-Fi on both devices (Google Photos, Dropbox) requires a stable connection.
  • 🔄 Account conflict: If the devices use different Google Accounts, the data will not be synchronized. Add the same account to both phones.
  • 📵 Manufacturer restrictions: Some brands (for example, Huawei without services Google) require the use of proprietary utilities. Check compatibility.
  • 🔒 Blocking by antivirus or firewall: Temporarily disable protection (for example, Avast or built-in Firewall in MIUI).
  • 🗃️ Lack of space: If there is not enough memory on the target device, synchronization will be interrupted. Free up at least 10-15% of the total volume.

If the problem persists, try resetting the synchronization settings:

  1. Go to Settings → Accounts → Google → Delete account (on both devices).
  2. Reboot both phones.
  3. Add the account again and turn on synchronization.
⚠️ Attention: On devices with Android 12 and newer, you may need to manually allow access to contacts and files in the application settings Settings → Applications → Google → Permissions.
💡

Before resetting the synchronization settings, be sure to check that all important data (contacts, photos) are saved in the cloud or on external storage. Otherwise, they may be lost when you delete your account.

7. Synchronizing game data and applications: what you need to know

Transfer game saves and application settings is one of the most difficult tasks. The fact is that most games and apps store data either in the developer's cloud (for example, Google Play Games for games), or in local files that are not always available for copying. Here's what you can do:

  • 🎮 Games with support Google Play Games: Log in to the same account on both devices - progress is synchronized automatically.
  • 📲 Applications with backup to Google Drive: Check the application settings (for example, WhatsApp or Telegram allow you to create a backup copy of chats).
  • 🔧 Manual file transfer: For games without cloud synchronization, copy the folder Android/data/[game_name] or Android/obb/[game_name] using a file manager.

For manual transfer:

  1. Connect the old device to the PC and copy the save folders (usually they are located in /sdcard/Android/data/).
  2. Connect the new device and paste the files into the same directories.
  3. Install the game from Play Market and check if the saving.

Please note: some games (for example, Genshin Impact or PUBG Mobile) link progress to an account on a social network (Facebook, TwitterIn this case, it is enough to log in to the new device through the same social network.

FAQ: Answers to frequently asked questions

Is it possible to synchronize two Android devices without the Internet?

Yes, the following are suitable for this:

  • Local Wi-Fi network (via Feem, Portal or Syncthing).
  • Cable USB OTG (for direct file transfer).
  • Bluetooth or NFC (for small files).

Cloud services (Google Photos, Dropbox) in this case are not suitable.

How to synchronize SMS between two Android phones?

Options:

  1. Use proprietary utilities (Smart Switch, Mi Mover).
  2. Install third-party applications like SMS Backup & Restore (saves SMS in XML and restores on the second device).
  3. Activate synchronization via Google Messages (if you use this application by default).

Please note: some mobile operators block the transfer of SMS through third-party applications.

Why are they duplicated after synchronization? contacts?

This happens if:

  • The devices used different Google Accounts with the same contacts.
  • Contacts were stored not only in Google, but also in the memory of the SIM card or phone.
  • When transferring through proprietary utilities (Smart Switch), the "Import all contacts" option was not disabled.

To delete duplicates, use the application Contacts Optimizer or manually merge contacts in Google Contacts (web version).

Is it possible to synchronize notifications between two phones?

Yes, there are specialized applications for this:

  • Pushbullet - transfers notifications, SMS and files between devices.
  • Join by joaoapps - supports synchronization of notifications, clipboard and even commands Google Assistant.
  • AirDroid - allows you to manage notifications remotely via the web interface.

For these applications to work, registration and access to notifications are required (Settings → Accessibility → Notification services).

How to synchronize data between Android and iPhone?

For cross-platform synchronization, the following are suitable:

  • Google Account — transferring contacts, calendars, mail and photos (via Google Photos).
  • Move to iOS (official application from Apple) - only during initial setup iPhone.
  • Cloud services (Dropbox, OneDrive) - for files and documents.
  • Syncthing — for synchronizing folders over a local network.

Please note: transferring SMS, call logs and some settings between Android and iOS is often impossible without third-party utilities.