AT&T is, yet again, switching up how it slows down data speeds for its remaining unlimited data plan users. On Thursday, the carrier said it would slow uploads and downloads for 3G (HSPA+) users who consume more than 3 gigabytes of data in a month.
If you're using a 4G LTE phone from AT&T and you have an unlimited data plan, then you'll see slower data speeds when you consume more than 5 gigabytes of data in a month.
Back in June, AT&T implemented a policy of slowing its unlimited data users' speeds only when they fell into the top 5% of users in terms of consumption -- with the changes, that policy is being abandoned. Previously, AT&T didn't slow speeds for unlimited data users.
If you have AT&T service and are on one of the company's tiered data plans, then the changes don't affect you.