- Immediate registration of the number via SMS or call automatically expels the attacker from the session.
- Managing linked devices allows you to detect and block unauthorized access from computers.
- Two-step verification and the use of recovery emails are the most effective barrier against hacking.
- Blocking the SIM card and notifying technical support are critical steps in case of physical theft of the mobile phone.
WhatsApp has become central to our daily communications, but that popularity comes at a price: it's a prime target for cybercriminals. Whether you're a cautious user or someone who's not particularly tech-savvy, anyone can fall victim to account theft if they're tricked or lose control of their mobile device.
The bad news is that there are various ways to compromise our privacy, from psychological tricks to the physical theft of the device. However, the good news is that if you know how to react and act quickly , regaining access to your chats is entirely possible by following official security protocols.
When your account is stolen using the verification code
The most common technique is social engineering. Attackers contact you pretending to be technical support or an acquaintance, scaring you by saying your account has been hacked or that you need to update something. The goal is to get you to give them the six-digit code you receive via SMS when you try to register your number on another phone. Once the criminal enters that code, you're locked out of your own app.
To resolve this issue and remove the intruder, you must re-register your number immediately. Reinstall WhatsApp or open the app and enter your phone number. When you receive the new code via SMS, enter it; at that moment, the attacker's session will automatically close. If you don't receive the SMS because you've made too many attempts, don't worry and use the call option so an automated voice can read you the numbers.
However, you might encounter a problem: the app might ask for a PIN you never set up. This means the thief has activated two-step verification to block you. In this case, there are no shortcuts, and you'll have to wait seven days to regain access. The good news is that, even though you can't log in, the attacker will have already been blocked by verifying the SMS in the previous step.
Spying through WhatsApp Web and desktop
Unlike SMS theft, here the attacker is usually someone with physical access to your phone, as they need to scan the QR code to link the computer. Although nowadays the system requires fingerprint or facial recognition, if someone knows your phone's unlock code, they can gain access without you noticing. To prevent this, it's helpful to know how to securely link a device to WhatsApp Web .
To clear your account of spyware, go to the settings menu and then to Linked Devices . There you'll see a list of all open sessions, the browser used, and the date of the last access. If you see something suspicious, simply tap on the session and select Sign Out to immediately cut off access.
What to do if your mobile phone or SIM card has been stolen?
If the problem is that you no longer have the device, the priority isn't the app, but the phone number. The first thing to do is call your carrier to block the SIM card and request a replacement. Without control of the phone line, it's impossible to receive the verification codes needed to log into WhatsApp.
To prevent the thief from reading your messages while you get a new SIM card, you can send an email to [email protected] In the subject line, write "Stolen/Lost Phone: Please deactivate my account" and include your full phone number with the international prefix (e.g., +34 for Spain). Please note that if 30 days pass after deactivation, the account will be permanently deleted.
If you have an Android or an iPhone, we recommend using remote lock tools (Google's Find My Device or Apple's iCloud) to erase your phone's data and prevent anyone from accessing your personal information. Once you have your new SIM card, reinstall WhatsApp and, if you had cloud backup enabled, restore your conversations to avoid losing your history. You can also find information on how to recover deleted WhatsApp messages.
Accounts suspended or blocked by the platform
Sometimes, when you try to log in, you'll see a message that your account has been suspended. This happens if the system detects that you've violated the rules, perhaps by using unofficial apps like the original WhatsApp Plus or by sending spam. If the suspension is temporary, you'll see a timer; you just have to wait for it to finish.
If the block seems permanent, you should request a review by tapping the corresponding button in the app or by contacting technical support. In the email, specify your phone model, operating system, and explain that you believe it was a mistake. Do not try other channels, as WhatsApp does not offer live chat or a customer service phone line. To better understand this process, review the reasons why WhatsApp might block or suspend your number.
Secure your account so it doesn't happen again.
The best defense is prevention. It is essential to activate the two step verification In Settings > Account, create a six-digit PIN that isn't obvious (avoid birthdates or sequences like 123456). This code will be the final shield preventing someone from using your number, even if they have the verification SMS.
To avoid being locked out yourself, set up a recovery email address . That way, if you forget your PIN, you won't have to wait a week to log in. Finally, remember the golden rule: never share verification codes with anyone, not even people claiming to be trusted or from technical support, as WhatsApp will never ask for this information via private message.
To maintain maximum security, it's vital to notify contacts when there's an identity theft issue, manage active session closures on computers, and rely on biometric authentication on your phone. The combination of a strong PIN, control over linked devices, and the ability to quickly block your SIM card in case of physical theft ensures your private information remains safe from cybercriminals.