Nokia is widely expected to launch its first Android smartphone at the Mobile World Congress tomorrow - and has hinted that it's new device will be called the X.
The manufacturer is expected to reveal the hotly-anticipated device at the world's largest mobile trade show, Barcelona's Mobile World Congress.
On the Finnish company's official blog, it has teased the new smartphone's name with four black arrow signs against a green background forming the letter X.
The handset - which is thought to be at the lower end of smartphone pricing - follows Microsoft buying Nokia's struggling mobile business in September in an effort to "accelerate" its challenge to Apple and Google.
Facebook founder Mark Zuckerberg said: "I grew up with the internet, but only a third of the world is on it today. We are really close to the beginning of this. The majority of people in the world have never seen anything like what you and I would call a computer."
Facebook's bold new look for Android becomes available from April 12.
Facebook is unveiling what's expected to be a big change in the way millions of mobile users access the site on their mobiles. The company gave little away before today's event in the US about its "new home on Android", but it could mean a new homescreen for many smartphones.
The launch of an "enhanced app" will reinforce Facebook's "mobile first" as users increasingly monitor the social networking site from smartphones and tablets, rather than desktop computers.