It depends on how your jurisdiction classifies “turning in a cell phone for a gift card.” Our insider friend explains:
Some Best Buy stores are located in jurisdictions that classify our trade in program as a pawn shop-like service. Because of this, we have to comply with local laws that regulate pawn shops. Some jurisdictions require two forms of photo id, while others go so far as having your picture taken and collecting fingerprints. Definitely annoying, but unfortunately not something we have a lot of control over.
They also sent us this list of stores nationwide that have these requirements: