Make sure your card is active and your cellphone/gadget can receive SMS
One-time Secret Code via SMS is only valid for 5 minutes.
Enter the code you received in the form to fill in immediately
ICCID is the 20 digits on the back of your Tri card
You only need to enter the last 4 digits
For iPhone and iPad users,you can find ICCID by selecting Settings > General > About > ICCID