Bell was redshirted in 2010. In 2011, he was the backup to Landry Jones, but would appear in the Sooners jumbo package, which led to 44 rushing attempts for 171 yards and 13 touchdowns. As a passer he completed one of four passes for eight yards and an interception. He was the MVP of the 2011 Insight Bowl after rushing for 51 yards on 10 carries with three touchdowns. He was again the backup to Jones in 2012 and used in the jumbo package. He rushed for 201 yards on 60 attempts with 11 touchdowns and completed nine of 16 passes for 107 yards.
In the spring of 2014, it was announced that Bell would be moving to tight end after the emergence of redshirt freshman quarterback Trevor Knight in the 2014 Sugar Bowl.