When the AT&T Straight Talk SIMs disappeared from their website, the AT&T Net10 SIMs disappeared from Net10's website. This wasn't much of a surprise, since Straight Talk and Net10 are just different brands of Tracfone and their BYOP SIM plans are essentially identical.
Net10 just released new info @ https://net10data.com/ stating that as of March 1st the Unlimited SIM plan will be capped at 1.5GB for people with AT&T SIMs. It's likely that the same will be announced for Straight Talk soon.
Even with a 1.5GB cap, it's a better deal than the 1GB plans from GoPhone, Red Pocket, or Airvoice.
Interesting. Thanks for posting this. While I'd obviously would prefer a 2GB cap, I can live with 1.5 for the price. If only T-Mobile would finish up the refarm around here. The 3G is still real spotty.