AT&T Prepaid iPhone SE 32GB Space Gray $199 includes $45 Airtime
I picked up one today and noticed on the back it said $45 airtime included. These usually don't come with that, just a free SIM card. This is at Best Buy. The ad doesn't show this information but you can look at the back of the box and it should say $45 included. You don't need to open the box to see this.
They send you a SIM like thin chip that you insert into the phone along with your SIM Card. The chip is placed below the SIM card and then restart the phone a couple of times. The phone is unlocked for any GSM carrier. I was able to use the phone on T-Mobile.