Mobile Fundamentals · Course 4
Wi-Fi & Bluetooth
The short-range radios, and how to use them safely.
- 1Joining Wi-Fi Safely12 min · Spot the risky networks in a crowded airport.
- 2Bluetooth Basics10 min · Pairing, range and the low-energy beacons all around you.
- 3MAC Randomization10 min · How phones avoid being tracked by their Wi-Fi address.
- 4NFC & Tap to Pay12 min · The 4-centimeter radio behind contactless payments.
Hands-on
Do it on the simulated phone
Every lesson has a lab you can try in your browser, plus questions that earn points toward the Signal Hopper badge.
Start lesson 1