I've looked over the Red Pocket $5 plan offer, and there's lots of unusual stuff. Clicking through, T-Mobile isn't available at all on some of the plans, even at a higher cost. (The 8gb, 15GB, and Unlimited.) (Verizon SIMs do show up, but not at the $5 promo price.)
The 30GB plan shows GSMA only at the promo price, not CDMAS..
Since it's Red Pocket, I don't know if it's bad page design, or if it's real.