Waste of time as others have said. I had two phone interviews and the questions were normal algorithmic questions. One on binary search trees (first round) and other on arrays (second round). Questions were mostly what others have mentioned in other reviews. I gave two optimal solutions in the second round and the interviewer was happy and told me to look out for an email from the recruiter within 1-2 days for the next steps. Got a reject on the second day without any feedback.