Phone & Device Security: Questions and Answers
Keeping phones, laptops, routers and smart devices safe: updates, malware, lost devices and home Wi-Fi.
How do I know if my phone has been hacked?
Common signs include apps you did not install, sudden battery drain or data use, pop-ups, settings that change on their own, unknown device administrator profiles, and accounts sending messages you did not write. One sign alone is often harmless; several together deserve a closer look.
Full answer and next stepsHow do I remove malware from my phone?
Update the phone, uninstall unknown or suspicious apps, remove any unrecognized device management profiles or admin permissions, and run the platform’s built-in protection scan. If the problem persists, back up personal files and factory reset the phone.
Full answer and next stepsCan someone hack my phone just by calling or texting me?
For ordinary users this is very rare. Attacks that need no click do exist, but they are expensive and usually aimed at specific high-risk people. The realistic danger from calls and texts is being persuaded to tap a link, install an app or share a code.
Full answer and next stepsWhy are software updates so important for security?
Updates fix security flaws that attackers already know about. Once a fix is published, criminals can study it to attack devices that have not updated, so delaying updates leaves a known, documented hole open.
Full answer and next stepsDo I still need antivirus software?
Modern Windows, macOS, Android and iOS include built-in malware protection that is enough for most home users when combined with automatic updates and careful downloading. Extra antivirus can help in some cases, but it does not replace updates, backups and MFA.
Full answer and next stepsIs it safe to use public Wi-Fi?
Public Wi-Fi is reasonably safe for browsing websites that use HTTPS, which encrypts the content of your connection. The bigger risks are fake hotspots with convincing names and sign-in pages that ask for personal details. Use your mobile data or a trusted VPN for banking and work.
Full answer and next stepsShould I cover my laptop webcam?
A cover is a cheap, harmless precaution, but webcam spying is uncommon and usually requires malware already on the device. Keeping the system updated, avoiding untrusted downloads and reviewing which apps have camera permission address the real cause.
Full answer and next stepsHow do I secure my home Wi-Fi router?
Change the default admin password, use WPA3 or at least WPA2 encryption with a long Wi-Fi password, keep the router’s firmware updated, and turn off remote administration and WPS if you do not use them. Replace routers that no longer receive updates.
Full answer and next stepsAre smart home devices a security risk?
They can be, mostly because some receive few security updates and ship with weak defaults. Buy from manufacturers that publish a support period, change default passwords, update firmware, and put smart devices on a separate guest network so a compromised device cannot reach your laptop.
Full answer and next stepsWhat should I do if my phone is lost or stolen?
Use Find My (Apple) or Find My Device (Google) from another device to locate, lock or erase the phone, call your carrier to suspend the SIM, and change the passwords of key accounts, starting with email. Report the theft to the police if you need a reference for insurance.
Full answer and next stepsWhat is the difference between an antivirus and a virus?
A virus is malicious software designed to infect devices, corrupt files, and spread across systems. An antivirus is defensive security software designed to detect, block, and remove viruses and other forms of malware. While a virus acts as the digital threat, an antivirus acts as your primary layer of software defense to protect your computer or phone from harm.
Full answer and next stepsHow does antivirus security compare to network firewall security?
Antivirus software protects endpoints by scanning files and memory to detect and quarantine malware. A network firewall protects the perimeter by inspecting data packets and filtering unauthorized network traffic between systems. Antivirus operates inside the operating system to neutralize malicious programs that arrive on a device. A network firewall acts as a boundary filter to block unwanted inbound and outbound connections before they reach internal endpoints. Together, they create layered defense.
Full answer and next stepsHow does an antivirus differ from a firewall?
An antivirus inspects, detects, and removes malicious software on your device, while a firewall monitors and filters incoming and outgoing network traffic. Antivirus focuses on malicious files, scripts, and code execution. A firewall acts as a digital barrier that blocks unauthorized network connections between your device and the internet. Both tools complement each other in a layered defense strategy.
Full answer and next stepsWhat is the difference between antivirus software and a VPN?
Antivirus software protects your device against malicious code, whereas a virtual private network (VPN) protects your internet traffic and data in transit. Antivirus detects, quarantines, and removes malware such as ransomware and spyware already on or entering your system. In contrast, a VPN creates an encrypted tunnel between your device and a remote server, masking your network address and shielding your browsing activity on untrusted networks.
Full answer and next stepsWhat is the difference between Windows Defender and third-party antivirus?
Windows Defender is a built-in antivirus solution provided directly by Microsoft, while third-party antivirus refers to standalone security software from independent vendors. Defender runs natively inside Windows without subscription fees or additional installations. Third-party antivirus programs often offer supplementary features, such as custom firewalls or specialized scanning engines. For most everyday users, Defender provides solid baseline protection, whereas commercial solutions cater to specific enterprise management needs.
Full answer and next stepsWhat is the difference between antivirus and malware protection?
Antivirus is a specific form of malware protection. Historically, antivirus programs targeted traditional computer viruses using signature matching. Malware protection is a broader category covering all malicious code, including ransomware, spyware, Trojans, and worms. Modern security tools combine both functions, but dedicated malware protection emphasizes behavioral analysis to catch new, evasive threats that signature-based antivirus scanners miss.
Full answer and next stepsWhat is the difference between an antivirus and a firewall?
An antivirus scans, detects, and removes malicious code from your device, while a firewall monitors and filters incoming and outgoing network traffic. Antivirus acts as internal inspection on your storage and running processes. A firewall acts as a barrier at the network perimeter, blocking unauthorized connections before data reaches your applications. Both work together to provide layered protection.
Full answer and next stepsCan an iPhone be used as a security camera?
Yes, you can repurpose an iPhone as a home security camera using third-party camera apps or smart home software. An iPhone provides high-definition video, motion sensors, and wireless connectivity. However, using an iPhone as a continuous security camera requires careful attention to software updates, device power, battery swelling risks, and account security to prevent unauthorized access to your video feed.
Full answer and next stepsCan antivirus detect a Trojan?
Yes, modern antivirus software can detect Trojans. Antivirus programs scan incoming files, running processes, and disk contents to identify known Trojan signatures and malicious behaviors. Because Trojans disguise themselves as harmless software to trick you into running them, security software actively blocks unauthorized modifications and isolates suspicious files before they can compromise your system.
Full answer and next stepsGo deeper
Step-by-step articles on this subject are in the Personal Security guides.