Apparently it's the phone network settings. Sort of like when people flash phones to Metro. But there's a 3rd website app a lot of people use that will automatically fill in all the info. But ST sends you the info to input in the activation kit. Your choice off you want to do it yourself, or let that non affiliated app do it.
Google YouTube Straight Talk activation kit. A bunch of petiole have shown what all comes in the box. Sims plus the APN info card.
Sent from my LTE LG Esteem (LG MS910)
Your creed may be interesting, but your deeds are much more convincing.