There's a lot more info on a smart-phone than the telco necessarily stores. They'll have call records, ip allocations, and maybe some low-res traffic logs. Pro

There's a lot more info on a smart-phone than the telco necessarily stores. They'll have call records, ip allocations, and maybe some low-res traffic logs. Probably cell/subcell location info for a while too. I doubt they'd be intercepting or snooping actual internet wire traffic though, and I can't imagine how they could keep it for any length of time, just by sheer volume (secret NSA junction-boxes notwithstanding). And any secure traffic over your data connection is pretty much safe, except for whatever traces it leaves on the phone itself (caches, browser history, downloads, etc)