Are cell phones allowed during DS school? If not, what about having a family member on EFMB?

Not during the duty day

This sounds a little vague. Are you just wanting to know in general about cell phone usage while at drill sergeant school? If so, then yes. But if not, what are you wanting inquire about specifically?

Also, what about exceptional family members are you wanting to inquire about?

Yes cell phones are allowed at Drill Sgt school. You will have your free time once the work day is over.