For most of us, our phones are the center of our daily lives, and as a result, they contain a treasure trove of personal information, from banking details to messaging and email accounts. This sensitive data can be pretty enticing to a range of the nefarious, from cybercriminals to someone you may even know.

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Phone hacking can involve the unknowing download of spyware that relays information on your activity – such as logging keystrokes to scrape passwords; spy apps downloaded by someone with access to your device; or other malware that exploits your phone, for example by using its internet bandwidth in a botnet, as occurred with malware that infected nearly 20 million Android devices.

“The most common way that smartphones can be hacked is to infect the device with malware,” says Victor Chebyshev, a security researcher at Kaspersky Lab. This malware can arrive on the device buried inside apps downloaded by the user – and the likelihood of a malicious app rises when downloading away from the official app stores, which police their content.

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While iPhones aren’t immune to hacking, Apple’s strict vetting policy means the incidence of bad apps targeting iPhones (at least non-jailbroken ones) is lower than for Android phones. “Android devices are more susceptible to these kinds of attacks because they have the option to install applications from third parties,” says Chebyshev.

9 steps to figuring out who hacked your phone

A sluggish phone or fast-draining battery are common symptoms of a compromised phone – but they can also indicate your device needs a spring clean to spruce up performance or improve its battery life. Another red flag is if your data usage has gone through the roof – this could indicate a dodgy app is sending data back to its mothership.

“Whether a user can determine who is responsible for a compromised phone depends on what kind of threat was on the device,” says Chebyshev.

According to Verizon’s 2020 Data Breach Investigation, 86% of cyberattacks are motivated by monetary gain – for example, through selling someone’s stolen credentials on the dark web, gaining access to financial accounts, or hacking sensitive data and holding the victim to ransom. In these cases, hackers usually rely on malware that remotely exploits vulnerabilities in apps or operating systems to steal information (or in the case of phishing malware, trick people into inputting their critical data).

However, somebody known to you who wants to monitor your movements – whether that’s a disgruntled ex or suspicious parent – and who has physical access to your device might also be able to install a spy app that acts like malicious software, tracking your location, photos, messages and calls.

To narrow down the field of suspects, you can try to determine exactly how your phone is being compromised.

1. Check your phone bill

Are you being charged for premium-rate texts you never sent – or texts you never signed up for? You’ve probably been infected by malware that forces your phone to send or receive texts that generate revenue for cybercriminals. This common form of mobile malware is believed to be the first type found targeting Android, back in 2010, and today plenty of it is still floating around.

If you’re receiving premium-rate text messages, try texting STOP to the number. If this doesn’t work, you’ll have to contact your cell carrier who should be able to block the number.

If your phone is sending the texts, you may be able to fix it by running a security app such as Bitdefender or McAfee to find and remove malware (on Android only; security apps for iOS don’t have this feature). Also, try deleting any third-party messaging apps and any other apps you installed just before the phone started sending the texts.

2. Go through your apps list

If there are any apps you don’t remember downloading, look them up online to see if any of them have been reviewed negatively for malware or other suspicious activity. In this case, the apps will have been compromised by a hacker who likely isn’t targeting you personally but is distributing malware with the aim of scraping as much data as possible. The BankBot malware, for instance, is a trojan that has infected hundreds of Android apps to display a phishing screen to steal users’ banking credentials.

“If it was a regular trojan [malware coded within another app] the user will not be able to attribute who was responsible for the attack,” says Chebyshev. “If it was commercial spyware, it’s sometimes possible to figure out the responsible person.”

3. Look up your flashlight and battery-saver apps

Got a phone full of apps and can’t remember for sure which you downloaded? Some categories of apps have attracted more than their fair share of malicious actors – several flashlight apps on Google Play were infected with malware that tried to scrape users’ financial info, while one should be wary of battery-saver apps as they have often been used for malware, says Josh Galindo, director of training at phone repair service uBreakiFix.

If you have these types of apps, check online for any negative reviews. You can also try deleting them to see if this affects your phone performance. “If you install an app and the device performance decreases, that’s an indicator,” says Galindo. “If you uninstall the app and your device begins working properly again, this means that the app is likely contaminated with malware and you should avoid downloading it in the future.”

4. Double-check your favorite popular games

Downloaded a new super-popular game recently? Ensure it operates like it’s meant to – and validate that by looking up reviews online – otherwise it may be a scam version, potentially ridden with cryptojacking malware.

Cryptojacking trojans mine cryptocurrency unbeknownst to users, and their prevalence has risen on smartphones that when infected in thousands, can deliver attackers a high overall processing power. The idea is that, if a cryptojacker hacks other devices, they can get paid for mining without having to use their own resources (or pay the electricity bill).

On mobile, cryptojacking malware tends to hide inside innocent-looking apps such as fake versions of popular games. If your phone slows down, heats up and its battery is dying long before the end of the day – and you’ve tried to improve your battery life– it could be a sign that a malicious app like a cryptojacking trojan is hogging all the juice.

They’re mostly prevalent on Android – and if you’ve downloaded from non-official app marketplaces, the risk is higher.

5. Scroll through your call list

Done all of the above and still convinced that someone somewhere has your personal data, siphoned from your smartphone? Apps aren’t the only way a phone can be infected by malware. Have you picked up any random calls lately? “Callers offering a free cruise or claiming that you won a sweepstakes are likely scam efforts to hack your information or record your voice,” says Galindo.

6. Did you click that link?

If you recently clicked on a link on a text message or an unexpected pop-up, you may have inadvertently fallen prey to phishing. Phishing often preys on panic or high emotion – as in the coronavirus-related scam texts clai

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