In recent years, the presence of fingerprint reader In mobile phones, it has gone from being an exclusive innovation to becoming a common feature, especially in mid-range and high-end devices. These sensors, presented by manufacturers as a revolution in terms of safety and comfort, promise to speed up device unlocking, mobile payments, and access to sensitive apps. However, the widespread adoption of this feature is thought-provoking: Do you really need a fingerprint reader on your smartphone?
Below, we exhaustively analyze all aspects related to the use of fingerprint readers, from security arguments to the impact on price, privacy, their true usefulness in everyday life, and the main technical issues that may arise. If you're considering purchasing a new phone or simply want to understand whether this technology is worth the investment, here you'll find a complete guide to help you make an informed decision.
What is a fingerprint reader and how does it work?
Un fingerprint reader It is a biometric sensor designed to record and compare a user's fingerprint with the one previously stored on the device. These sensors come in various types: optical, capacitive, and ultrasonic, each with its own method for scanning and storing the fingerprint.
Most current smartphones have a built-in reader on the back, under the screen, or on the side of the device. With a brief touch, the system compares the fingerprint provided at that time with the stored biometric data and, if it matches, grants access to the phone's content.
Top reasons why you don't need a fingerprint reader on your smartphone
The popularization of fingerprint readers has led to their integration into most mid-range and high-end smartphones, but there are three compelling reasons why you might not really need it on your next device:
- The security it promises is not absolute and has its own vulnerabilities.
- Ease of use does not mean that it is essential for the average user.
- The final price of the device is usually higher because it incorporates this technology.
Security: Is the fingerprint reader really secure?
One of the biggest draws for installing fingerprint readers is the biometric securityTheoretically, only you can unlock your phone with your fingerprint. But to what extent is this true?
Manufacturers claim that biometric authentication provides an extra layer of security compared to passwords, patterns, or PINs, since your fingerprint is unique and cannot be lost or forgotten. But the current reality shows us that Fingerprint readers are not infallible either.Various investigations and real cases have shown that it is possible copy and clone a fingerprint with relatively accessible materials, such as latex, silicone, clay or even a simple high-resolution photograph.
Also, since We leave our footprints in countless places (glasses, keyboards, doors, screens), cybercriminals with the right resources could gain access to them. As the Chaos Computer Club And according to recent security experts, cloning a fingerprint and bypassing the sensor is much easier than it seems. And the most worrying thing is that, Unlike passwords, your fingerprint cannot be changed..
There is another controversial factor: privacy vis-à-vis third parties and authoritiesIn some countries, the police can force you to unlock your smartphone using your fingerprint, as it's considered "physical" evidence, not intellectual. However, a password or unlock pattern is only known to you, and even law enforcement cannot require you to say or write it down.
So while fingerprint readers add a convenient layer of protection, They do not completely replace traditional security and have their own vulnerabilities to consider.
Known vulnerabilities in fingerprint readers
- Virtual fingerprint capture: Malicious apps can simulate unlock screens to record your fingerprint and authorize actions without your consent.
- Forced physical access: In situations like theft, someone could unlock your phone by placing your finger on the sensor, especially if you haven't had time to disable the feature.
- Storage of biometric dataIf the databases where these fingerprints are stored are hacked, your data can be used indefinitely.
- Sensors vulnerable to physical damage: Bumps, scratches and dirt can affect the sensor's accuracy and reliability, as well as create false negatives.
What alternatives are there to protect your mobile phone?
- Long passwords with a combination of letters, numbers, and symbols
- Complex unlock patterns
- Double authentication (combining fingerprint with PIN or Face ID)
These alternatives are still available and, in many cases, offer comparable—or even superior—security to biometrics, especially if you change your passwords regularly.
Convenience and real utility: Does the user experience change that much?
La comfort This is the second major argument in favor of the fingerprint reader. It's true that unlocking your phone with a touch can be faster than entering a PIN or pattern. However, The difference in the actual user experience is not that great. so that the fingerprint reader is essential.
Currently, many users continue to unlock their devices using patterns or passwords without any major issues. Furthermore, most sensible apps support both forms of authentication (biometric or classic). For mobile payments, fingerprint payments are still available in most countries. It is neither standardized nor mass-produced, so the daily usefulness of this feature is limited.
On the other hand, there are situations where biometrics can fail, such as when your fingers are wet, dirty, or have wounds, or even when using the phone with gloves. Additionally, factors such as direct sunlight, sweat, or dry skin negatively affect the sensor's accuracy.
Payments and authentication in apps: Is there a real difference?
- Mobile paymentsAlthough some banks and payment platforms offer fingerprint authentication, most purchases still require a PIN, signature, or additional confirmation, especially in large stores or when the amount is over a certain amount.
- Secure apps: Banking, messaging, and email apps often offer additional authentication, but also allow the use of traditional keys in case of sensor issues.
- Quick unlock: The small time saving when unlocking the phone is noticeable, but it doesn't radically change the daily user experience.
The vast majority of users could do without this feature without losing key functionality in their daily lives.
Price: Does the fingerprint reader really still make a phone more expensive?
One of the factors that most influences the purchasing decision is the priceThe incorporation of premium biometric sensors, especially the latest generation under-screen or ultrasonic ones, increases the final price of the terminalAlthough there are currently Chinese or mid-range mobile models with this technology at reasonable prices, devices from well-known brands tend to offer the reader as a distinguishing feature of the high-end range, and this is reflected in the final bill.
The key question is: Is it worth paying more just to have a fingerprint reader? If your security and convenience needs are met by PINs, patterns, or two-factor authentication, it's probably worth opting for a device without this feature and saving a significant amount of money.
Privacy risks and fingerprint storage
A little debated aspect is the one referring to the privacy and biometric data managementWhen you store your fingerprint on a phone, this information is usually recorded on the device itself, but in some cases it's used to access cloud services or authenticate transactions. While manufacturers promise advanced encryption and isolation of biometric data, the risks never completely disappear.
Furthermore, large biometric databases belonging to governments or private entities have been hacked in the past, as demonstrated by the leak of millions of public employee fingerprints. When this data is compromised, The fingerprint, unlike a password, is permanentYou won't be able to generate a new fingerprint like you can reset your password.
- Legislation such as the General Data Protection Regulation (GDPR) in Europe mandates the restricted and secure use of biometric data, but there are still risks associated with storing, transmitting, and processing this information.
- Digital footprints can be exploited long after they are leaked and used for identity theft, fraud, and unauthorized access to protected services.
Situations in which the fingerprint reader can be a risk
- Theft and forced physical accessIf your phone is stolen, you can be forced to unlock it by placing your finger on the sensor, which is much easier than forcing you to enter a complex password.
- Legal conflictsIn some countries, police may require you to unlock your device with your fingerprint, while the law protects the use of passcodes or PINs as a right to avoid self-incrimination.
- Database leaksIf a hack exposes your digital footprint stored in a government or corporate database, the impact is irreversible and long-term.
Common problems when using the fingerprint sensor
Although the fingerprint reader is presented as an infallible system, technical problems are not uncommon and can frustrate your everyday use:
- Failed or erroneous readings: Dirt, grease, moisture, changes in your skin, or minor wounds can prevent the sensor from recognizing your fingerprint.
- Errors after system updates: Changes to the firmware or security apps may render the sensor unusable until it is reconfigured or updated again.
- Sensors affected by bumps, falls or scratches: Especially those integrated into the rear or side, they can lose accuracy or stop working after physical damage.
- Interference from screen savers: Many non-certified protectors can make proper fingerprint recognition difficult or impossible, especially on under-screen sensors.
- Compatibility issues with cases and accessories: Some cases may partially cover the sensor, making it difficult to use.
What to do if you have problems with the fingerprint reader?
If you experience problems, there are several basic recommendations before calling for technical service:
- Make sure you have a certified screen protector and clean, and try to register your fingerprints again.
- Check that your fingers are not wet, very dry, or damaged.
- Clean the sensor and check if the fault is due to dirt or grease.
- Re-register your fingerprint from scratch if you've recently changed your screen protector or case.
- Update to the latest version of the operating system.
- Restart your phone and try safe mode if you suspect an app is interfering.
If the problem persists, the sensor may be damaged and you should contact specialized technical support.
Alternative use cases: Where does a digital footprint make sense?
There are areas where fingerprint readers offer real advantages, but these are usually in professional or high-security environments:
- Business access control and work assistance: prevents impersonation and speeds up employee entry and registration.
- Digital legal signatures: as additional evidence in legal proceedings.
- Border control and biometric passports: to speed up identification and prevent fraud.
In the context of the home user, the real benefits are limited and do not necessarily justify the premium prices, vulnerabilities and limitations described.
How to disable the fingerprint reader on your smartphone?
If you have decided to do without this biometric method, both Android , the iPhone They allow you to temporarily or permanently deactivate the fingerprint reader, reinforcing security in delicate situations:
- Access the security settings of your mobile.
- Look for the option of biometric data and deletes all stored fingerprints.
- Activate only the PIN, pattern or password.
Many devices also allow you to quickly disable your fingerprint in emergencies, such as on iPhone by repeatedly pressing the lock button, and on Android via the power menu.
Common mistakes and tips to avoid problems with the fingerprint sensor
Some common mistakes affect the reader experience and can be easily avoided:
- Record the fingerprint in optimal conditions: Make sure your finger is clean and dry.
- Register more than one finger: for example, thumb and index finger of both hands to gain flexibility.
- Place your finger correctly every time: Use the same position as for registration.
- Avoid thick or low-quality screen protectors, and make sure they are certified.
- Clean the sensor and your fingers regularly before use.
RE: Three reasons why the fingerprint reader is NOT necessary
Well, there are cheap mobiles that bring it. I have a Chinese Ulefone Be Touch 2 that cost me €126 and comes standard. The same today is not very useful, but later yes. I use it to lock the phone and block applications that contain data from my work, so some use if I give it.