Learn how phones actually work.

MobDojo teaches mobile security hands-on: how phones, SIM cards and cell networks work, Android and iPhone security, SIM swapping and scams, mobile forensics, malware, exploits and data recovery. 375 short lessons across 15 tracks, each with labs on a simulated phone in your browser. The first course of every track is free.

Browse all lessons · Grade your phone's security · Quick answers

Track 1: Mobile Fundamentals

Start from zero: what's inside, how it talks to towers, how apps are kept apart. Every module runs on a simulated phone, right in your browser.

• Inside a Phone: What's physically inside the slab in your pocket.
• SIMs & Identity: The numbers that identify you and your phone to the network.
• Cellular Networks: How a phone finds a tower and keeps a call alive on the move.
• Wi-Fi & Bluetooth: The short-range radios, and how to use them safely.
• Mobile Operating Systems: How Android and iOS keep apps in their lanes.

Track 2: Mobile Networking

Follow your data from the phone to the server and back: packets, DNS, encryption, and exactly who can see what along the way.

• How Apps Talk: Packets, addresses, DNS and ports: how data finds its way.
• Encryption in Transit: How HTTPS keeps your data private on its way to the server.
• Watching Traffic: What others on a network can see, and how to check your own apps.
• Mobile Data Under the Hood: How a phone gets online over cellular, shares it, and stays reachable.
• Network Privacy: VPNs, encrypted DNS, Private Relay and trackers, minus the hype.

Track 3: Android App Security

How apps are built, signed and boxed in, what their permissions really allow, and how to spot and remove a bad one. Hands-on labs on a simulated phone.

• Inside an APK: Open an Android app and see what it's made of and who signed it.
• Permissions in Depth: How Android guards your data, and which kinds of access are risky.
• Components & Intents: See how apps' parts talk to each other, and which doors stay locked.
• Storing Data Safely: Where apps keep files, keys and secrets, and how data leaks out.
• Spotting Bad Apps: Recognize, avoid and remove harmful apps before they do damage.

Track 4: iOS Internals

How iOS is built and locked down, the privacy controls you actually have, keeping your Apple Account safe, and spotting scams, trackers and spyware. Hands-on labs on a simulated phone.

• Inside iOS: How an iPhone is built, signed, sandboxed and kept up to date.
• Locks & Encryption: How an iPhone guards your data with keys, faces and fingerprints.
• iPhone Privacy Controls: Take charge of what apps, ads and iOS itself learn about you.
• iCloud & Your Apple Account: Protect the account, backups and passwords behind your iPhone.
• Staying Safe on iPhone: Spot scams, rogue profiles, trackers and spyware on an iPhone.

Track 5: Mobile Forensics

How investigators preserve a phone, where the evidence lives, how timelines are built, what the cloud holds, and how to report it honestly. Hands-on labs on a simulated phone.

• Forensics Foundations: How phone evidence is found, protected and collected the right way.
• Where the Evidence Lives: Find the databases, photos and places a phone quietly remembers.
• Timelines & Analysis: Decode timestamps and build timelines that hold up.
• Cloud & Account Evidence: Learn what the cloud holds, how it's reached, and where it stops.
• Reporting & Ethics: Prove evidence is intact, report it plainly and stay within scope.

Track 6: Mobile Malware

What mobile malware is, how analysts take an app apart, how it talks to its servers, real documented cases, and how it gets detected and stopped. Hands-on labs on a simulated phone.

• Malware Basics: What mobile malware is, how it pays, and who it really targets.
• Inside a Malicious App: Take a suspicious app apart, watch it run, and share what you find.
• Cutting Off Malware: See what defenders spot on the network, and how malware is cut off.
• Real-World Cases: Four documented mobile attacks, from mass smishing to zero-click.
• Detection & Defense: See how platforms, companies and researchers find and stop threats.

Track 7: Exploits, Tools & Data Recovery

How bugs become attacks and get patched, the defenses that stop them, the phone-unlocking and forensic tool industry, and the truth about deleted data and factory resets. Hands-on labs on a simulated phone.

• How Bugs Become Attacks: How flaws get found, named, scored, exploited and finally patched.
• Bug Classes & Mitigations: The kinds of bugs attackers use and the defenses that stop them.
• Passcode Bypass & the Unlocking Industry: Who unlocks phones, how the law treats it, and how phones resist.
• The Forensic Tool Landscape: Know the forensic tools, how they are tested and where they go wrong.
• Deleted vs Reset: Myths & Reality: What delete and reset really erase, and where your copies survive.

Track 8: Computer Basics

For anyone who feels lost on a computer: turning it on, the mouse and keyboard, windows, files and folders, the internet and email. Practice on a pretend computer where nothing can break. The whole track is free.

• Meet Your Computer: The parts, the buttons and the plugs, explained in plain words.
• Mouse, Touchpad & Keyboard: Click, drag, scroll and type with calm, steady confidence.
• Windows & the Desktop: Find apps, handle windows and calmly fix a frozen program.
• Files & Folders: Save, find, move and delete your files without the worry.
• The Internet & Email: Browse the web, find the right site and send your first email.

Track 9: Staying Safe Online

Strong passwords, fake virus pop-ups, phishing emails, real and fake download buttons, updates, and the backup that saves the day. Practice on a pretend computer where nothing can go wrong.

• Passwords & Sign-ins: Make strong passwords, stop reusing them and lock your accounts.
• Scams & Fake Pop-ups: Spot fake warnings, fake shops and fake buttons, and know what to do.
• Email & Message Tricks: Spot fake emails and texts, check links and report scams.
• Updates & Antivirus: Keep your computer updated, protected and safe from fake warnings.
• Backups & Bad Days: Keep a spare copy of your files and know what to do on a bad day.

Track 10: Everyday Computer Skills

Install and remove apps safely, print and save PDFs, take screenshots, use zip files and cloud storage, join video calls, and keep your computer running smoothly. Practice on a pretend computer.

• Installing & Removing Apps: Get apps from safe places, remove old ones, and speed up startup.
• Documents, PDFs & Printing: Documents, PDFs, printing, screenshots and zip files, made simple.
• Cloud Storage: Keep files on every device, share them safely and get them back.
• Video Calls & Devices: Keep your camera private, join calls with ease and connect devices.
• Keeping It Running: Speed up a slow computer, free up space and care for the battery.

Track 11: How Computers Work

What's inside, what happens when you press power, how Windows runs your apps, what really happens to deleted files, and how your computer finds its way online. Hands-on labs on a pretend computer.

• Inside a Computer: The parts inside the case, what they do, and how to read specs.
• Starting Up: What your computer does between the power button and sign-in.
• How an Operating System Works: Processes, accounts, permissions and drivers, made clear.
• Files & Storage Deep Dive: How drives store, delete and truly erase your files.
• Your Computer on a Network: How your computer finds the internet, and what to check when it can't.

Track 12: Windows Inside & Out

Settings and sign-in, Task Manager and performance, updates, drivers and restore points, calm troubleshooting, and a careful look under the hood at the registry, services and the command line.

• Settings & Accounts: Find any setting, choose your account and set up easy, safe sign-in.
• Task Manager & Performance: Read the graphs, find what slows you down, and spot when it began.
• Updates, Drivers & Restore Points: Control updates, fix drivers and undo changes that go wrong.
• Troubleshooting Windows: Calm steps, built-in repair tools and a clean reset when needed.
• Windows Under the Hood: How the registry, services, system folders and the terminal work.

Track 13: Home Networks & Wi-Fi

How home internet works, faster Wi-Fi in every room, what's inside your router, locking down your Wi-Fi, and keeping smart gadgets in their place. Hands-on with a pretend router.

• How Home Internet Works: Understand your modem, router, speed and who to call.
• Wi-Fi Speed & Coverage: Faster Wi-Fi in every room: bands, placement, generations and mesh.
• Inside Your Router: Get into your router, keep it updated, and know who is connected.
• Securing Your Wi-Fi: Lock down your home Wi-Fi and stay safe on networks you don't own.
• Smart Home Devices: Set up cameras, speakers and smart gadgets so they stay yours.

Track 14: Mac Inside & Out

Finder and Spotlight for switchers, System Settings and accounts, Activity Monitor and storage, updates, Time Machine and Recovery, and a look under the hood. Practice on a pretend Mac.

• macOS Basics for Switchers: Moving from Windows to a Mac, without the confusion.
• System Settings & Accounts: Set up your Mac, your Apple Account, users and accessibility.
• Activity Monitor & Storage: Find what slows your Mac, free up space and save battery.
• Updates, Time Machine & Recovery: Keep a Mac updated, backed up, and ready to recover or sell.
• macOS Under the Hood: See how your Mac works inside, and keep its deepest parts safe.

Track 15: Windows Security

Get the most from Windows Security, secure your Microsoft account with passkeys, understand BitLocker, keep up with Patch Tuesday, and investigate a PC that might be hacked. Defensive, hands-on labs.

• The Windows Security App: Learn every guard inside Windows Security and how to read it.
• Accounts & Sign-In Security: Check your sign-ins, use passkeys, limit admin and lock up.
• BitLocker & Encryption: Lock your drives, guard the recovery key, know what it covers.
• Patch Tuesday & Vulnerabilities: Read the monthly fixes and close the gap before attackers use it.
• Is My PC Hacked?: Spot real warning signs, clean up and take your PC back.