HOUSTON, Texas (KTRK) -- As the Houston Independent School District returns to school, there is a rule in place that parents should know about when it comes to students' cell phones.

The "No Personal Communication Device" rule bans cell phones, tablets, smartwatches, headphones and earbuds, and smart glasses during the school day, which runs from when students arrive on campus in the morning until the final period of the day.

HISD said lunch and passing periods are also included.