The reports said celltower-level location data associated with calls and texts (but not datestamps). That would allow inferring their homes, job location, commute, family members, social graph.

You can still recover that without timestamps. It also looks like if anyone interacted with an ATT customer or used an MVNO your data is in there too.

It even said land lines had their numbers in the data if an ATT customer contacted one.

Edit: I must have read that from a different article than the TFA though.

Yeah, all att customers, 2nd party participants and any other user of their network. Not just direct customers.