AT&T’s grandfathered unlimited plans are vestiges of an earlier era, when unfettered access to mobile data was a perk offered to those willing to buy into the smartphone before it became ubiquitous. Now, those plans are getting costlier — again. AT&T has just announced a $5 increase on its grandfathered unlimited plans, bringing the total cost per month to $40, according to a report from DSLReports yesterday and confirmed by ArsTechnica today. That follows a $5 increase back in February of 2016, meaning those plans have jumped more than 30 percent in a little under one year.

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