Privacy settings to keep your mobile phone safe

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Your smartphone has become much more than just a phone: it's your camera, your wallet, your calendar, your health record, and in many cases, your work tool. That small device contains a massive amount of personal and sensitive data. which can end up in the wrong hands if you don't take good care of security and privacy.

Between private photos, conversations, browsing history, banking apps, emails, and documents, your mobile phone knows more about you than many people around you. The good news is that Android, iOS, and interfaces like Samsung One UI include plenty of privacy and security settings. which, when properly configured, greatly reduce the risk of data theft, espionage, or impersonation.

System security and privacy settings: your command center

On modern Android phones (and particularly on many Samsung phones) you'll find a section for “Security and privacy” which focuses on the basic options for protecting the deviceAlthough in some models these sections still appear separately as "Security" and "Privacy". This screen usually displays a general summary of the phone's status.

Typically, the top part displays an indicator such as "All good" if the phone is well protected, or, conversely, a warning like “The device is at risk” with an explanation of the problem and recommendations To fix it (activate lock, update the system, check permissions, etc.), it's a good idea to log in from time to time and follow the suggestions that appear.

From that same security and privacy zone are centralized functions such as the permissions manager, Google Play Protect, device encryption, and access to the "Data Security" section of Google Play, where You can see what data each app collects before installing or updating it.This security information tells you if the app accesses your location, contacts, photos, history, etc.

In the case of Samsung, there are also usually additional sections such as Secure Folder, device protection against malware, and specific privacy options. It is highly recommended to browse through all these menus at your leisure. first time you set up your mobile phone and repeat the check periodically.

Mobile locking and encryption: the first line of defense

The most basic, yet most important, setting is the screen lock. Without an active code, PIN, pattern, or biometric system, anyone who picks up your phone will have direct access to everything.Chats, photos, banking apps, email, social media, etc. There's no discussion here: locking the device is mandatory.

On Android, go to Settings > Security and privacy > Screen lock or Device unlock (The name may vary depending on the brand.) On iPhone, go to Settings > Face ID & Passcode or Touch ID & Passcode. Choose a strong PIN (avoid 1234, 0000, obvious birthdates) or an alphanumeric password, and combine this lock with your fingerprint or facial recognition.

If you can choose, It is safer to use a PIN or password than an on-screen pattern.because fingerprints can give away the drawing. Also, set the auto-lock time to the shortest possible time. The sooner you turn off and lock your phone after you stop using it, the less opportunity a thief will have. to touch it if you get distracted.

Most current mobile phones already come with encrypted storage by default, so The data is stored in an unreadable format and is only decrypted when the device is unlocked.On many older Android devices, the "Encrypt phone" setting still appears within Security: if this is your case, it is advisable to activate it (with the phone fully charged, as the process may take a while).

On iOS, you can check the encryption by going to Settings > Touch ID/Face ID & Passcode: at the bottom of the screen you should see something like “Data protection is activated”This indicates that your storage is encrypted and linked to the lock code.

Location, apps, and tracking: control who knows where you are

Location is one of the most sensitive pieces of data your mobile phone handles: it allows us to know where you live, where you work, what places you usually visit, and even reconstruct your daily routines. That's why it's crucial to limit as much as possible which apps can access GPS and under what conditions.

On Android, go to Settings > Location > App permissionsYou'll see a list of all the apps and the type of access they have: always, only while the app is in use, always ask, or don't allow. For the vast majority of apps, the wisest course of action is to select "Always," "Only," or "Only." “Do not allow” or, at most, “Always ask”except in apps that really need your location (maps, transport, food delivery, weather, etc.).

On iOS, location permissions are managed from Settings > Privacy and security > Location servicesThere you can decide on a case-by-case basis whether an app can see your location always, only when it's being used, or never. You also have the option to use precise or approximate locationThe approximate location is usually sufficient for weather or some news apps.

Both Android and iOS display an icon or badge when an application is using the location, camera, or microphone. Pay attention to those indicators, because they're your telltale sign that something is accessing your sensors.And check which app it is if it appears when it shouldn't.

Beyond GPS, Android includes a specific option for ad tracking. On many models, you'll find the route. Settings > Services > Ads or “Privacy > Ads”. Activate the “Disable ad personalization” option or similar to reduce the tracking of your activity for advertising purposesIt doesn't make you invisible, but it does significantly reduce your visibility.

Camera, microphone, photo, and file permissions: cut off access to snoppy apps

In recent years, concern has skyrocketed about apps that request excessive permissions: games that want access to the microphone, flashlights that ask for camera access, PDF editing apps that demand location access… Review and trim these permissions It's one of the most effective privacy settings you can make on your mobile phone.

On Android, go to Settings > Privacy > Permission ManagerThere you'll see categories like Camera, Microphone, Files and Media, Contacts, Calendar, etc. Go into Camera and check which apps have access; do the same with the microphone. Disable these permissions in all apps where they are not strictly necessary. for its funtionability.

On iOS, the process is very similar: Settings > Privacy and security > Camera y MicrophoneFrom there, you can remove access for apps that don't need to record video or take photos. Again, the goal is to only have access for video calls, social media (if you upload content), scanning apps, and little else.

Photos deserve a special section. Many apps need to access your gallery to allow you to upload or edit an image, but That doesn't mean they should have indefinite access to all your photos.On both Android and iOS, when an app requests this permission, the system lets you decide whether to give it full access, access only to selected photos, or access only once.

If you made a mistake when granting the permission or you change your mind, you can modify it by going to the settings of that app or the system permissions manager. It's good practice to limit access to the gallery to "only selected photos" or "always ask"especially in lesser-known applications or those that don't need to scan your entire photo library.

Secure folder and app lock: where to store your most sensitive files

Many manufacturers, such as Samsung or Xiaomi, add a feature to Secure folder or private space that acts as a "mobile within a mobile"It's an isolated environment with its own encryption and additional locking where you can store apps, photos, documents, and sensitive notes.

In the case of Samsung, Secure Folder allows you to install copies of applications (for example, your banking or insurance app) inside that container. The data you store there is protected by a PIN, fingerprint, or pattern independent of the rest of the system.So even if someone manages to unlock your main mobile phone, they still won't be able to enter that area without their specific key.

Regarding your question about where it's best to install sensitive apps (like banking or insurance) on a Samsung, the most recommended option is Keep them inside the Secure Folder, not the other way around.In other words, use the folder as the area of ​​maximum protection for the most sensitive files, and leave only the essentials in the main profile.

The ideal workflow would be something like this: you use your normal profile for browsing, social media, messaging, and so on; and when you need to access your bank or work apps with critical data, You manually access the Secure Folder, log in, and work there.This provides an extra layer of protection against prying eyes, theft, and, above all, malware that could escalate permissions on the main profile.

In addition to the secure folder, some Android layers allow block specific apps with PIN, password or biometrics without needing a separate container. This is common in custom interfaces, and also in apps like WhatsApp, which include an internal locking option. Enabling them adds a second layer of protection, especially useful for messaging apps, email, or photo galleries.

History, personalized ads, and activity on Google: reduce the amount of data that is stored

Google offers a very convenient ecosystem full of free services (Search, Chrome, Gmail, YouTube, Maps, etc.), but that convenience comes at a cost: Your activity is recorded extensively to feed advertising profiles and improve their algorithmsIf you want to improve your privacy on Android, one of the key steps is to trim these histories.

From the Google app or any browser, log in to your Google Account > Data and PrivacyThere you'll find the three main activity sections: "Web & App Activity," "Location History / Timeline," and "YouTube History." It's recommended to... disable all three or, at least, limit their automatic saving. so that a complete record of everything you do is not accumulated.

In that same section you'll see "My Ad Center" or "Ad Center", where you can disable personalized ads and search personalizationThis reduces the ability of Google and third-party companies to target you with campaigns based on your behavior and inferred interests.

It's important to understand that even with these settings disabled, Google still collects certain information necessary for its services to function, but the intensity of advertising profiling is significantly reducedIf you want to go even further, the alternative is to "unGoogle" your mobile: stop using its applications in favor of private options.

For example, you can replace Gmail with a privacy-focused email provider, use a browser other than Chrome, or even, for advanced users, install a custom ROM without Google services. The latter requires technical knowledge and is not for everyone, but it exists and is the way to almost completely minimize dependence on Google.

Gemini, AI in the search and massive collection of data

Google's commitment to artificial intelligence through Gemini is being integrated into many of its apps and services. This means that, To improve AI responses, Google is interested in processing even more information from your accounts and daily usage.If privacy is a priority for you, you should carefully review these options.

In your account settings and in each Google app (Gmail, Photos, Chrome, etc.), look for the sections related to Gemini or “AI Mode”You'll usually find options to disable Gemini's access to your apps, to turn off Gemini's activity history, and to delete already recorded activity.

Google Search is rolling out a mode where AI generates summaries at the top of the results. While this might be convenient, These types of functions increase the processing of your query history and other data associated with your account.If you're concerned, go into the search settings and disable "AI mode" or any equivalent options that may appear.

Consider that Google earns billions from data-driven advertising and that Android, being its operating system, is a huge source of information about your digital life. Every small adjustment that reduces their access (history, permissions, AI, location) adds up to protecting your privacy.although you can't completely cut off the flow if you continue using their services.

Web browsing and password managers: what to change to be more secure

Chrome is the default browser on most Android devices, but it's not exactly the most privacy-friendly. Even its Incognito mode has been under scrutiny for data collection While many users believed they were browsing without leaving a trace, changing browsers is a very effective measure.

There are privacy-focused alternatives that block trackers, third-party cookies and suspicious scripts from the very beginning. Installing one of these browsers on your Android significantly reduces ad tracking. and profile creation. This change alone significantly improves your level of protection while browsing.

Another sensitive issue is Google's built-in password manager in Chrome and Android. It's convenient, yes, but It also centralizes all your credentials and payment methods in a single account.which makes it a juicy target if there are ever any leaks or unauthorized access.

To disable Google's password manager, open Chrome, go to Settings > Password Manager, and turn off the "Saved passwords" option or something similar. Then, in “Payment methods” unchecks “Save and fill in payment methods” so that your card is not automatically stored in the browser.

Instead, consider using a separate, well-audited password manager. These tools create and store unique and strong keys for each service, encrypted and synchronized across your devices, and often offer password generators, leak alerts, and convenient autofill options.

WiFi, Bluetooth and open networks: reduce your exposure when you connect

Public WiFi networks (cafeterias, airports, shopping centers…) are very convenient, but also a goldmine for cybercriminals if they are not properly configured. In an open network without encryption, it is relatively easy to intercept traffic. or set up "Man-in-the-Middle" attacks to spy on what you're doing.

Whenever you have to use public WiFi, try not to enter highly sensitive data such as bank passwords or card details, and if possible Connect through a reliable VPN that encrypts all traffic between your mobile phone and the internet. This greatly complicates the work of anyone trying to snoop on that network.

At home, make sure your home network is well protected: change the router's default password, use WPA2 or WPA3 encryption, and avoid network names that give away too much of your address or provider. A good home WiFi setup is just as important as your mobile phone settingsbecause practically everything you do happens through there.

It's also good practice to turn off WiFi and Bluetooth when you're not using themMany devices broadcast information about networks and devices they've previously connected to, and an attacker can set up fake access points to trick your phone into connecting automatically. Turning off the radios when you don't need them drastically reduces that attack surface.

Finally, get into the habit of checking for the padlock icon and the "https" prefix in your browser before entering personal or payment information. A site without HTTPS encryption is a very inappropriate place to type sensitive information.especially if you're not on your home network.

Common threats on mobile phones: what can really happen to you

In addition to bad practices, it is important to be clear about what types of threats affect smartphones today. Mobile malwareRansomware, SMS and social media phishing, spyware, and configuration attacks are commonplace. of cybercrime on mobile devices.

Malicious apps and websites can slip through even into official stores if they temporarily pass the filters, although the risk is much higher when you download APKs from unknown sites. Many of these apps are designed to display fraudulent ads, steal data, or hijack your device..

Mobile ransomware, for example, blocks access to your phone or encrypts your files and demands a ransom in cryptocurrency to return them. It has become more prevalent as mobile phones are increasingly used for work, because It can paralyze both the user's personal and professional life.

Phishing has shifted significantly to SMS messages, WhatsApp, Telegram, and social networks: links that appear to come from your bank, the parcel company, or a close contact. Avoid opening suspicious links and never enter your credentials from messages you weren't expecting.It's best to open the official website or app yourself and check if there's actually a warning.

Spyware, on the other hand, is a type of spy software that can collect your call history, messages, location, contacts, and even photos without your knowledge. It often arrives through... applications that seem harmless, attachments, or even through brief physical access to the device.

Good daily practices: habits that make a difference

Beyond specific adjustments, mobile security depends heavily on your daily habits. A few small changes in how you use the device can save you a lot of trouble. in the medium and long term.

First, get used to using unique, long (at least 16 characters) and difficult to guess passwords for each service. This way, if a website suffers a breach, attackers will not be able to reuse that same password on other sites (known as "credential stuffing" attacks).

Combine this with two-factor authentication whenever possible, preferably using authentication applications or U2F physical keysInstead of SMS. That way, even if they steal your password, they still won't be able to log in without the second factor.

Secondly, don't use your Google, Facebook, or Apple account to sign up for everything you see. Linking your main account with third-party applications multiplies the amount of data shared. and broaden your exposure if any of those services are compromised.

Furthermore, uninstall any apps you don't use. Each additional app is a potential entry point: it can leak data, have vulnerabilities, or change hands over time. The fewer apps you have installed, the smaller your attack surface is. and you give away less data.

Finally, get into the habit of clearing your browser history regularly and logging out of sensitive websites (banking, shopping, e-government) after using them. If someone gains access to your mobile phone while you're logged in, it will be much easier for them to operate on your behalf.especially if the browser saves passwords and payment methods.

Updates, download sources and antivirus: the extra layer of protection

An outdated operating system is a magnet for problems. New vulnerabilities appear regularly and are patched, so Installing Android or iOS updates as soon as they are available is vital to maintain the level of security.

On Android, you can check it in Settings > About phone > Software update (or similar). On iOS, go to Settings > General > Software update. Avoid letting too much time pass between when a patch is released and when you install it.especially if it involves critical security fixes.

Regarding apps, always download from Official stores like the Google Play Store, or, if you're looking for more private and open-source alternatives, repositories like F-Droid.The stores are not infallible, but the pre- and post-download controls are far superior to any random download website.

If you're considering unlocking or rooting your phone to gain control or install custom ROMs, keep in mind that Removing manufacturer protections leaves the door much more open to malicious apps. And it can override security mechanisms like encryption or verified boot. It's something only for very advanced users who know exactly what they're doing and are willing to take the risk.

Finally, using a reputable antivirus solution on Android adds another layer of protection against malware, Trojans, spyware, and dangerous websites. It does not replace good habits or the adjustments we have discussed.But it can detect and block threats that might slip through the net, as well as offering useful features like device location or remote wiping.

In the end, your mobile phone is almost like your mailbox, your wallet, and your personal filing cabinet, all rolled into one. Take some time to properly configure security, monitor permissions, limit data collection, and adopt good daily habits. It makes a huge difference in how exposed you are to theft, scams, and digital espionage.