Phil Lester lives with his best friend and fellow video blogger Dan Howell in London. He earned a degree in English language and linguistics and then a post graduate in the Department of Theatre, Film and Television and got a Master of Arts in Video Postproduction with Specialisation in Visual Effects at the University of York.

In 2011, Lester won a Guinness World Record for fastest coin stacking, placing 25 coins on top of each other in 31.617 seconds.

At age 19, Lester posted his first YouTube vlog. Since then he has posted over 150 videos on his channel and as of August 2014 has over 1.9 million subscribers with over 127 million video views, reaching 1 million YouTube subscribers on 6 July 2013. He is part of the Fantastic Foursome, a group of British YouTubers consisting of himself, Chris Kendall (crabstickz), Dan Howell (danisnotonfire) and PJ Liguori (KickthePj).

Lester has appeared alongside Howell in Benjamin Cook's 12-part web series Becoming YouTube, being interviewed on the various topics Cook covered. He is also confirmed to be in the second series.

Lester collaborated with YouTubers CharlieSkies and SarahGrace in early 2009 on a channel called pabloislove, but the collaboration ended after only a short time and now appears on YouTube under the name "It Was Fun While it Lasted."

Lester and Howell created a collaborative YouTube channel through network My Damn Channel, called The Super Amazing Project, in which the duo discussed and investigated paranormal events. Segments included "Viewers Spooky Happenings," where the audience of the show would send in "scary" items for the vloggers to react to. As of August 2014, the channel has obtained over 570,000 subscribers and over 21 million video views.

In December 2012, the YouTube show finished its third season of 12 episodes.

The BBC announced that starting in January 2013, Lester and Howell would present the Sunday night entertainment and request show for national UK radio station BBC Radio 1. Both had occasionally worked with Radio 1 before, making videos for the station's YouTube channel and presenting two Christmas broadcasts.

The show is designed to be an interactive, audio-visual broadcast involving music videos made by viewers, physical challenges performed on air by Howell and Lester, and song requests from listeners.

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