According to the survey commissioned by the Verizon Foundation, more than a third of middle school students use smartphones to do their homework.
Students from all income levels and ethnic groups reported using smartphones for homework. That included 29 percent of students from low-income families.
But 88 percent of the students said they were not allowed to bring their smartphones into the classroom and 66 percent said they could not use a tablet in school.
The online interviews with 1,000 sixth- to eighth-graders were conducted by TRU, a Chicago-based research company that specializes in tweens, teens and young adults. The margin of error is plus or minus 3 percentage points.