Smartphones hold personal conversations, financial information, photos, passwords,
work files, and access to countless online accounts. Most people rely on mobile devices
for shopping, banking, navigation, entertainment, and communication, making them a
rich source of personal information.
According to the Pew Research Center, approximately 98% of Americans used a cell
phone of some kind in 2025. Of these, about 91% owned a smartphone. The number is
up from 35% in 2011.
Despite the convenience, smartphones also present security risks. Every app installed,
permission granted, and public Wi-Fi connection used creates another opportunity for
cybercriminals or malicious software to access sensitive information. Even trusted apps
can collect more data than users realize. For that reason, understanding how personal
information is stored and shared is essential.
Fortunately, improving mobile security does not require advanced technical knowledge.
Following a few simple security practices can greatly lower the risk of unauthorized
access, identity theft, and data loss.
Review App Permissions Regularly
Many people install an application, approve every permission request, and never think
about those settings again. Over time, dozens of apps may gain access to your contacts,
camera, microphone, location, photos, and files without any ongoing review.
It is important that you check permissions on every new app you install. A simple
weather app rarely needs access to your call history. Requesting unrelated permissions
is a red flag worth noticing.
Some applications may even use this access inappropriately to their advantage. Consider
Snapchat, one of the most widely used social media platforms worldwide. According to
TorHoerman Law, many people have filed lawsuits alleging that Snapchat is addictive
and causes mental problems.
Snapchat also asks for various permissions that enable it to connect users with their
friends and other nearby people. Discussions surrounding the Snapchat lawsuit have
highlighted broader concerns about user privacy and consent.
Although every situation is different, these conversations remind users that
understanding app permissions is very important. The Cybersecurity & Infrastructure
Security Agency (CISA) even recommends uninstalling unused apps. For the ones you
keep, limiting access only to essential data is the best practice.
Keep Your Phone and Apps Updated
Software updates are about much more than new features and interface improvements.
Software updates often contain security patches that address vulnerabilities identified
by researchers and developers. Attackers often attempt to exploit these weaknesses
before users install the latest updates.
The National Cybersecurity Alliance states that automatic updates alone aren’t
foolproof. Devices still require a restart or manual approval to complete installation.
Checking your update settings every few weeks helps close that gap. Scammers also
disguise fake “update available” pop-ups as a trick to install malware. Only update
through official app stores or your device’s built-in settings.
Ignoring updates for weeks or months leaves devices exposed to known security issues
that could already have publicly available exploits. Installing updates promptly reduces
that risk and strengthens your phone’s overall security.
Removing apps that are no longer supported by developers is just as important. Without
ongoing security updates, outdated applications become more susceptible to new
threats. Replacing outdated software with actively maintained alternatives helps keep
your device secure.
Use Strong Authentication for Every Important Account
A smartphone acts as the gateway to email, banking, shopping platforms, cloud storage,
healthcare portals, and social media profiles. Unauthorized access to one account can
quickly lead to compromises across multiple accounts.
Relying only on passwords is no longer sufficient to secure sensitive accounts. IBM
notes that compromised credentials and phishing together cause roughly a quarter of all
data breaches. Multi-factor authentication (MFA) adds an extra verification step beyond
a password, such as a fingerprint, a one-time code, or a physical security key.
Even if a hacker steals your password, MFA can still block their access. Unfortunately,
not every app implements this consistently. A study published in PLOS ONE in 2024
analyzed the authentication methods used by 50 e-commerce apps.
It found wide inconsistencies in how login and password recovery flows were designed.
That inconsistency can confuse users and weaken overall account security. Enabling
MFA whenever it is available provides an additional layer of security.
Avoid Public Wi-Fi Without Proper Protection
Some cybercriminals set up fake Wi-Fi hotspots with names that closely mimic
legitimate networks. Unsuspecting users may connect automatically, giving attackers
opportunities to intercept sensitive information or monitor internet traffic.
Public Wi-Fi at places like cafes and airports often lacks strong security. A virtual
private network (VPN) encrypts your internet traffic, making it much harder for others
on the same network to intercept your data. This matters most when checking email or
banking on the go.
You can also use a VPN when traveling, streaming, or gaming. In all these cases, you just
need to select and install a VPN of your choice, then choose a server. In most cases, you
can start a VPN by clicking or tapping the “Connect” button.
Google’s 2026 Android security update introduced stronger theft protections, including
biometric locks triggered when a phone is marked lost. These features build on decades
of academic research into device security. Some devices even lock automatically once a
trusted network is out of range. Combining a VPN with an updated lock screen closes
two major gaps at once.
Be Careful What You Download and Click
Cybersecurity Dive reported that one CISA alert warned users that multiple threat actors
have used “sophisticated targeting and social engineering techniques to deliver spyware
and gain unauthorized access to a victim’s messaging app.”
This allows threat actors to deploy additional malware, giving them deeper access to the
target device. Fake text messages, fraudulent emails, deceptive advertisements, and
counterfeit app stores remain common methods used to spread malware.
Install apps only through trusted platforms like the Apple App Store or the Google Play
Store. Even then, take time to review developer information, recent updates, user
reviews, and download numbers before installing unfamiliar apps.
Pay close attention to links received through text messages or messaging apps.
Scammers frequently pretend to represent delivery services, banks, government
agencies, or well-known online platforms to pressure people into acting quickly.
Before clicking any link, verify the sender and inspect the web address carefully. Small
spelling differences or unusual domain names often indicate fraudulent websites
designed to steal login credentials.
Frequently Asked Questions
How frequently should I carry out a full security check on my smartphone?
A complete mobile security check every three to six months is a good practice for most
users. During the review, inspect installed apps, connected devices, account recovery
information, backup settings, and active login sessions. Conducting a complete security
check once a month can help detect potential problems before they escalate.
What steps should I take right away if my smartphone is stolen?
If your smartphone is stolen, act as quickly as possible. Use your phone’s remote
management tools to locate, lock, or wipe the device if needed. Then update the
passwords for your primary email, banking apps, and other critical accounts, as many
services use your phone for identity verification.
Are refurbished smartphones safe to use?
Refurbished smartphones can be a safe option when purchased from reputable sellers
that inspect, repair, and certify their devices. Before you start using a device, perform a
factory reset and install the most recent software updates. You should also verify that
the phone is not linked to a previous owner’s account and check that security features
are functioning correctly.
Mobile Security by the Numbers
- Number of Americans using a smartphone in 2025: 91%
- Smartphone ownership in 2011 in the USA: 35%
- Data breaches involving compromised credentials and phishing: Around 25%
- Recommended mobile security review: Every three to six months
- Recommended review for frequent app users: Monthly
- Trusted app download sources: Stick to the Apple App Store and Google Play Store
Your smartphone contains some of your most valuable personal information, making
mobile security an ongoing responsibility rather than a one-time task. Fortunately,
protecting your device does not require expensive software or advanced technical
expertise. The habits mentioned above take very little time but provide meaningful
protection against many of today’s most common threats.
Making security a regular part of your routine helps safeguard your privacy, financial
information, and digital identity for years to come.
