The guy who started Android just teased the new phone he's building

Andy Rubin, the founder of Android who sold the smartphone operating system to Google, teased a new smartphone he's working on through his stealthy startup on Twitter Monday.

Take a look:

Rubin, who left Google in 2014, is now the CEO of Essential, a startup that sources have told Business Insider plans to release a new high-end smartphone to compete with the iPhone and Samsung's Galaxy phones. The Essential phone is expected to launch this spring or summer.

Essential has also gathered a roster of notable executives from the smartphone world, from companies like Apple, Magic Leap, Samsung, and HTC. The company was expected to announce a major round of funding soon, but The Wall Street Journal reported last week that SoftBank backed out of a deal to invest $100 million.

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