Here at Fortress Security Store, we are upgrading our cellular network! Because of this we now have a newer style of SIM card. This blog post has more informaiton about the SIM cards that we offer.
If you are purchasing a new system today which includes a SIM card, it will be shipped with one of our "New" Style SIM cards.
Here's an FAQ article talking about our SIM cards as well:
"New" Style SIM card
To activate these cards, you'll enter the last 6 characters (5 numbers and 1 letter) on the website.
Coverage map for "New" Style SIM card
"Old" Style SIM card
To activate these cards, you'll enter the Act Fast Code on the website
We may send you an "Old" Style SIM card if your current SIM card is not within our coverage area on the new network.