AT&T is apparently cracking the whip when it comes to popular MVNO Net10. The company has announced on its site that new AT&T data caps went into effect on March 1. From here on out, all AT&T SIMs on Net10 will be limited to 1.5GB of high-speed data on the "unlimited" plan. If you want more bytes, a T-Mobile SIM is your only option.
Net10 has always been a bit vague about how much data you can go through before hitting the soft cap. The language used in the blog post appears to indicate this change just moves the cap lower. It's not ideal, but at least you'll know exactly when the throttling is coming (though this may be a hard cut off; Net10 wasn't clear). Anyone that can't get by on 1.5GB of high-speed data will need to dig up a T-Mobile SIM card for Net10. The carrier is at least being polite by offering a free replacement Tmo SIM to anyone that needs to switch.
StraightTalk is run by the same folks behind Net10, but that carrier hasn't issued any statement on AT&T data caps. StraightTalk has been sold out of AT&T SIMs for weeks, but it's not clear if the two events are related. We've reached out for comment and will update if we hear anything.