Deleted all files from the phone, but the Android memory is still full - 7 ways to get free space back

You have deleted all photos, videos, music and even unnecessary applications, but the phone persistently signals: "Memory full". The situation is familiar to many owners of Androiddevices, especially with budget smartphones with 16–32 GB capacity. What's the catch? The fact is that the operating system reserves part of the memory for system files, application cache and hidden data, which are not displayed in the standard file manager. Moreover, some processes (for example, updates or application crashes) can create "junk" filesoccupying gigabytes of space.

In this article we will look at 7 proven methods freeing up memory when all the "obvious" files have already been deleted. You will learn how to find and clean hidden cache, delete duplicate system data, disable unnecessary Android functions, and also what to do if the problem lies in damaged file system. Important: some methods require superuser rights (root), but most solutions work without them.

Before Before you start cleaning, check if the memory is really full. Go to Settings → Storage and see the distribution of space. If the partition "System" or "Other" takes up a disproportionate amount of space (for example, 10+ GB on a 32 GB phone), the problem definitely lies in hidden files.

1. Clearing application cache and system cache

Caches are temporary files that applications create to speed up their work. Over time, they accumulate and can occupy several gigabytes. However, standard deletion of an application does not always clear its cache.

To delete the cache of individual applications:

1. Go to Settings → Applications.
2. Select an application (for example, YouTube or Chrome).
3. Click "Storage" → "Clear cache".

For mass clearing the cache of all applications use the built-in function:

1. Open Settings → Storage.
2. Tap on the item "Other applications" or "Cached data".
3. Confirm clearing.

If these methods do not help, try deleting system cache via Recovery mode:

1. Turn off the phone.
2. Hold down the button combination (usually Volume up + Power or Volume down + Power + Home, depends on the model).
3. In the Recovery menu, select Wipe cache partition (button control volume, confirmation with the power button).
4. Reboot the device.

⚠️ Attention: Do not confuse Wipe cache partition with Wipe data/factory reset —the latter will reset the phone to factory settings!

Delete the cache of frequently used applications (social networks, browsers, instant messengers)

Clear the system cache via Recovery

Check the Downloads folder for unnecessary files

Delete data of unused applications (not only the cache, but also "Storage")

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2. Removing duplicates and junk files

Android often creates duplicate files during updates, backups or crashes. For example, photos can be stored simultaneously in DCIM/Camera and Pictures/Screenshots, and downloaded files can be stored in Download and folders of specific applications.

To find and remove duplicates:

• 🔍 Use a file manager with a duplicate search function (for example, Files by Google or SD Maid).
• 📁 Check the folders:
  • Android/data — application data is stored here (sometimes remains after uninstallation).
  • Android/obb — game files (may weigh 1–2 GB each).
  • .thumbnails — thumbnail images (hidden folder, takes up to 500 MB).
• 🗑️ Delete the folder Lost.DIR —it is created when the file system fails and can weigh several gigabytes.

Important: Some folders (for example, Android/data) are not visible without root-rights. If you have superuser rights, use Root Explorer or FX File Explorer for deep cleaning.

The following applications are suitable for automated garbage search:

• 📱 Files by Google — built-in cleaning tool Google.
• 🧹 CCleaner —finds temporary files and remnants of deleted apps.
• 🔧 SD Maid —an advanced utility for finding duplicates and “dead” files.

⚠️ Attention: Memory cleaning applications often require additional permissions. Do not provide access to SMS, contacts or geolocation - this is unnecessary for their operation!

3. Clearing system application data

Many built-in applications (Google Play Services, Google Play Store, Android System WebView) accumulate data that cannot be deleted using standard methods. For example, Google Play Services can occupy 1–3 GB only due to the cache and temporary files.

To clear them:

1. Go to Settings → Applications.
2. Tap on the three dots in the upper corner and select "Show system processes".
3. Find applications like:
   • Google Play Services
   • Android System WebView
   • Download Manager
   • Media Storage

Warning: Clearing the data of some system applications can lead to:

• 🔄 Reboot device.
• 🔓 Temporary loss of synchronization with your Google account.
• 📱 Resetting the settings of some functions (for example, Android Auto or Google Pay).

If after cleaning the phone becomes unstable, reboot it. The data will be restored automatically the next time you connect to the Internet.

4. Disabling unnecessary Android functions

Some functions Android actively consume memory, although you do not use them. Here's what you can safely disable:

Also check automatic downloading of multimedia in messengers:

• 📸 In WhatsApp: Settings → Storage and data → Automatic downloading of multimedia → Disable for mobile data.
• 🎵 In Telegram: Settings → Data and memory → Startup → Disable for audio/video.

Critical information: If you have it installed Android 10+, the system can reserve up to 5 GB as “protected storage” for updates. This space is not displayed in the file manager and is not cleared using standard methods.

5. Scan for viruses and malware

Some viruses and adware modules create hidden files or disguise themselves as system processes, consuming memory. For example, Trojans of the HiddenAds family can download advertising banners in the background, occupying hundreds of megabytes.

How to check your phone:

1. Install a highly rated antivirus (for example, Malwarebytes or Bitdefender).
2. Run a deep scan.
3. Pay attention to applications with suspicious permissions (access to SMS, contacts, geolocation for no reason).

Signs of infection:

• 📱 The phone slows down for no reason reasons.
• 🔋 The battery runs out in a few hours.
• 📎 Unknown files appear in the root folder (for example, com.android.system or update.apk).
• 🛑 Advertising pops up on top of all windows.

If the antivirus has found threats, but cannot remove them:

1. Go to Settings → Applications.
2. Find the suspicious application and click "Delete" or "Disable".
3. If the button is inactive, this is system software. In this case, only resetting to factory settings will help..

6. Reset to factory settings (last chance)

If none of the methods helped, it remains Hard ResetThis will delete all data, including:

• 📱 Applications and their settings.
• 📂 Photos, videos, music (if they are not on the SD card).
• 📋 Contacts, SMS, call logs (if not synchronized with Google).

How to reset:

1. Create a backup copy of important data (via Google Drive or on a PC).
2. Go to Settings → System → Reset settings.
3. Select "Delete all data (reset to factory settings)".
4. Confirm the action.

If the phone freezes or does not respond to commands, reset via Recovery:

1. Turn off the device.
2. Hold down the button combination to enter Recovery (see section 1).
3. Select Wipe data/factory reset.
4. Confirm and wait for the reboot.

⚠️ Attention: On some phones (for example, Xiaomi or Samsung) after the reset, you may need to enter the account data that was linked earlier (FRP lock). Make sure you remember your login and password!

7. Alternative solutions: root, custom firmware and SD cards

If you are ready to experiment, consider advanced methods:

1. Obtaining root access

• 🔓 Allows you to remove system applications (bloatware) and clean folders that are inaccessible to a normal user.
• 🛠️ Tools: Magisk (for modern Android), KingRoot (for older versions).
• ⚠️ Risks: loss of warranty, possible phone breakdown, problems with banking applications.

2. Installing custom firmware

• 📱 Firmwares like LineageOS or Pixel Experience are devoid of unnecessary software and are optimized for performance.
• 🔧 Requires unlocking the bootloader and root access.
• 📉 Cons: possible bugs, lack of official support.

3. Transferring applications to an SD card

• 📁 Works only on Android 6–9 (in new versions the function is limited).
• 🔄 Not all applications support transfer.
• ⚡ The SD card must be formatted as internal memory (configured in Settings → Storage).

For most users, these methods are redundant, but if you are technically savvy, they can be a lifesaver for phones with low memory.

⚠️ Attention: Unlocking the bootloader and installing custom firmware can lead to data loss, void the warranty and problems with the operation of some functions (for example, Google Pay or Netflix in HD).

FAQ: Frequently asked questions about full Android memory

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