My first (and only) interview was by phone, and was fairly in-depth for what I expected to be a typical screening call. Aside from an introductory question about my background, all other questions were the "scenario" type — "What would you do if...", "How would you respond to...", "Tell me about a time when..." (according to other Glassdoor reviews here, this style of interview is apparently typical for Amazon regardless of the position). Many of the questions connected in some way to Amazon's leadership principles (available on their jobs website), so be sure to review those in advance. If you're the type of person who would rather give thoughtful answers than rattle off something off the top of your head, this type of interview may be somewhat challenging or stressful (And note to Amazon: may disadvantage otherwise qualified candidates whose processing or communication styles tend toward other strengths than thinking on your feet). I'd recommend coming up with some anecdotes that demonstrate problem solving, conflict resolution, customer service, etc. that you can draw from so you're not caught off guard.