How to remove all contacts from Xiaomi Redmi 9 phone: the full guide

Owning a Xiaomi Redmi 9 smartphone requires a periodic need to clean up the digital space, and one of the most common tasks is to completely clean the phone book. Users often face situations where thousands of duplicates, old numbers or spam contacts have accumulated that interfere with the normal operation of the device and finding the right subscribers. The removal process may seem difficult only at first glance, but in fact, the MIUI system offers several effective tools for solving this problem.

In this article, we’ll take a look at all the methods available, from standard interface features to radical ways through a Google account. You’ll learn how to safely erase all information without risking damage to the operating system or losing other important data, such as photos or documents. The right approach to managing contacts is key to the speed of your Xiaomi Redmi 9.

Before you take any action, you need to understand where your records are stored, because it's the choice of cleaning method that determines how to do that. SIM-A careful analysis of the storage source will avoid situations where deleted numbers mysteriously return after a reboot.

Preparing for removal: backup and synchronization

Any manipulation of important data should be initiated only after you have created a backup. Even if you plan to completely get rid of all the numbers, there is always a chance that in a week you will need the number of an old friend or business partner that you have safely forgotten. The Xiaomi and Android ecosystem has powerful backup tools that should not be neglected.

The most reliable way is to use Google Contacts, a cloud-based service that not only saves numbers, but also restores them at any time, even if you change your phone or reset your device to factory settings. Deleting contacts through Google's web interface allows you to roll back changes within 30 days, which is a unique insurance against accidental loss. To activate sync, go to your phone's settings and find the account section.

Alternatively, you can create a local backup through the built-in Security or Xiaomi Services app, which you can save to a memory card or send to yourself by email. Local copy is especially useful if you don't have a stable Internet connection or prefer to store data offline. It's important to make sure that the backup includes the Contacts section, not just messages or call logs.

• 📱 Open the settings and select "Accounts and synchronization".
• ☁️ Click on your Google account and make sure the Contacts switch is active.
• 💾 Create a backup through the menu "Advanced settings" →"Recovery and discharge".
• 🔒 Check if the backup file is in the folder MIUI/backups internal.

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Before mass deletion, export contacts to a.vcf file and send it to your messenger – this is the fastest way to create an additional security copy.

Delete contacts through the standard "Contacts" application

The most obvious and affordable way to clean a phone book is to use the built-in app that is pre-installed on each Redmi 9. The interface allows you to select groups of objects and perform mass operations, which greatly speeds up the process compared to manually deleting one number, but there are nuances associated with how the system groups records.

To start, open the Contacts app and find the Control button, often indicated by three dots or a pencil icon, in the top or bottom menu (depending on the MIUI version), and select the Edit or Contact Management option from the menu that appears.

To delete all the records, click on the all-item highlight icon, which usually looks like a tick box or "Select All." The system will highlight all the visible contacts, then click on the basket icon. The phone will request confirmation of action, as this is an irreversible operation for the current session. Once confirmed, the process will take several seconds, depending on the amount of memory occupied by the phone book.

It is worth noting that this method only removes contacts that are displayed in the current form, SIM-card and phone memory), you may need to switch the display list in the settings of the application itself to clear them too. Sometimes users forget about hidden contacts or numbers fixed in messengers that integrate into the general ledger.

⚠️ Note: When deleting via the app, make sure you don’t sync real-time data to the corporate server, otherwise changes can automatically be duplicated to your working devices.

Cleaning through the Google Contacts web interface

The most efficient and modern way to manage a phone book on Xiaomi Redmi 9 is to use the web version of Google’s service, which gives the user much more control and functionality than a standard mobile application, allowing you to see the full picture of what is stored in the cloud, and the interface on the large screen of the computer monitor is much more convenient for navigating thousands of records.

To get started, you need to open your browser on your computer or in full-site mode on your smartphone and go to the Google Contacts page. Log in to the same account that you use on your phone. You'll see a full list of all the synchronized numbers. You can use filters, search and group editing tools here.

On the left side of the screen, find the menu and select the option "Select All." If you have more than 100 contacts, the system will suggest expanding the sample to all entries in the list ("Select all X contacts"). Once all entries are highlighted, click on the basket icon or select "Delete" from the action menu. The changes will take effect instantly and in a couple of minutes will affect your Redmi 9 after synchronization.

The advantage of this method is that it has a Cancel Change feature that is available in the web interface settings, so you can roll back the status of the phone book to any point within the last 30 days, a unique feature that is not available in standard Android applications, and it saves you in cases where mass deletion was made incorrectly.

Using third-party cleaning applications

When standard tools are not enough or a deeper cleaning of duplicates and broken links is needed, specialized applications from the Google Play store come to the rescue. There are many utilities, such as Contacts Optimizer, Clearer or Duplicate Contacts, that automatically analyze the database and suggest removing the extra ones.

The main danger of such programs is to request extensive permissions to access your personal data. When installing an application, carefully read what rights you grant it. Some unscrupulous developers may use access to the phone book to collect statistics or send spam. Only choose trusted applications with high ratings and a large number of reviews.

The process of working with such utilities is usually automated: you run a scan, the application finds similar numbers (for example, with different recording formats +7 and 8) and suggests combining or removing them. Automating the process saves time, but blind trust in algorithms can lead to the loss of important records if the program misses the definition of duplicate.

• 🔍 Download the high-rated app from the official Play Market store.
• 🛡️ Carefully review the permissions requested before installation.
• 📋 Make a backup before running the scan.
• ✅ Manually check the list of candidates for removal before final confirmation.

⚠️ Avoid applications that require root rights to delete contacts, as this may compromise the integrity of system files. MIUI And lead to unstable operation of the phone.

Radical method: complete resetting of settings

If your goal is to get your phone ready for sale or get rid of all the data, including contacts, apps and files, then the only surefire solution is a full reset to factory settings (Hard Reset), which is guaranteed to remove all user data from the internal memory of the Xiaomi Redmi 9, returning the device to the “out of the box” state.

To perform the reset, go to the Settings menu, then select About Phone and find Reset. The system will warn you that all data will be destroyed. You will need to enter the screen unlock password or PIN-Identity code, and then a process will begin that will take a few minutes.

It's important to understand that this method removes not only contacts, but also photos, music, installed apps and logins. This is irreversible, so using this method is only justified in extreme cases or when transferring the device to a new owner. SIM-card and memory card before the procedure, although modern phones do not usually erase external drives when reset.

There is also the option of resetting via Recovery Mode if the phone is not turning on normally, by pressing the power and volume buttons when the device is off. From the recovery menu, select "Wipe Data." This is more commonly used for repairs or flashing, but for simple contact removal, it is redundant and difficult for the average user.

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A complete reset is the only way to ensure that contacts cannot be retrieved by software, which is critical when selling a phone.

Frequent problems and their solution

During the cleaning process, users of Xiaomi Redmi 9 can face various technical difficulties. One of the most common problems is when contacts are deleted, but after a while they reappear. This is almost always due to synchronization: the phone automatically downloads data from the cloud or another account that you forgot to turn off.

Another problem is the inability to delete certain contacts that are marked as system or app-related (e.g. emergency contacts or operator service numbers) that are protected from deletion by standard methods. They require the rights of a superuser (Root) to delete, but it is not recommended to interfere with system files without deep knowledge, as this can disrupt the communication module.

There is also a “Not enough memory” error when trying to mass delete if the app cache is full, in which case cleaning the cache of the “Contacts” and “Contacts” application will help. SIM-Once the cache is cleaned, the deletion procedure should be repeated. Sometimes it helps to switch the display mode (for example, from All Contacts to Phone").

• 🔄 Check the list of active accounts and disable the synchronization of unnecessary accounts.
• 🧹 Clear the cache of the "Contacts" application in the section of application settings.
• 📵 Make sure that SIM-The card is not full and does not block the recording of changes.
• 📶 Check the Internet connection, as out-of-synchronization can cause errors.

If none of the methods work and contacts continue to “resurrect,” it is possible that the phone has malware or an application that forcibly restores the phone book, in which case it is recommended to check the device with antivirus or conduct a complete reset with the formatting of internal memory.