I don't think Coinbase support provides a direct phone number.
You have a few other options for contacting them or getting assistance:
There is a community discussion forum:
https://community.coinbase.com/You could use Twitter:
https://twitter.com/coinbaseThey also have a Facbook page:
https://www.facebook.com/CoinbaseOr, you could send them a letter:
Coinbase Customer Support
548 Market Street, #23008
San Francisco, CA 94104-5401
USA