I’m in my cell reading fan mail

from Drake (Ft. Jay Z & Lil Wayne) – Light Up Remix Lyrics on Rap Genius

Meaning

At the time Lil Wayne was still arrested in March 8 in 2010 after being found with unlicensed weapons.This remix is called “Rikers remix” on some sites because Weezy recorded a verse was recorded on the phone in Rikers Island where he was arrested.
http://www.rollingstone.com/music/news/timeline-the-criminal-history-of-lil-wayne-20101105

So Weezy here is telling us that at the time when he was penning this verse he was busy going through his fan mail.Weezy love his fans,he also posted a video on Ustream to his fans that says “To all my fans, my real fans I really, really truly love you. I love you with all of me for real.” before being sentenced
http://www.ustream.tv/recorded/4579486

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