Mobile Fundamentals · Course 2
SIMs & Identity
The numbers that identify you and your phone to the network.
- 1The Three Numbers12 min · IMEI, IMSI and ICCID, and which one belongs to what.
- 2eSIM10 min · A SIM card with no card: how eSIMs get set up.
- 3SIM Swapping12 min · How attackers steal phone numbers, and how to stop them.
- 4Carrier Locks10 min · Why some phones only work on one network.
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 SIM Keeper badge.
Start lesson 1