I had two rounds of phone interviews.

In the first round, the interviewer asked me about my current experience, motivation to work at Google, etc. I believe this was mostly to get an understanding of who should be interviewing me.

In the second round, the interview was mostly technical. I was asked some coding questions, questions about memory management, and data structures.

I was asked a question about the following:

If a user types in an n-digit number on the telephone, how do you write a function to deduce if the number constitutes a valid word?

For example, if the user enters 123, can a valid word be made out of (a/b/c) + (d/e/f) + (g/h/i)?