I had one phone screening, which I did not pass, because I was unable to complete my coding within the given time frame. Overall the interview went clear, I was given hints, we talked about possible solutions, complexities and everything was friendly. That's why my overall impression is positive. Later, after the interview, I was able to solve it in a relaxed environment within 30 minutes. Which is still too long for phone screen. Conclusion: you need practice more, more and more..