Apple Inc. is scaling back how much information its iPhones store about where they have been and said it will stop collecting such data when consumers request it, as the company tries to quell concerns it was tracking iPhone owners.

But Apple's statements, after a week of silence on the growing controversy, raised new questions and criticism about its data-handling practices. Rep. Joe Barton (R., Texas) said Apple apparently "lied" to him and another lawmaker last year when it said its phones don't collect and transmit location-based...