Maddie has had a cell phone at school since 4th grade and last year (6th grade) she began using it to text me her numbers. She does all her care independent of the nurse: bolusing and correcting and testing whenever and where ever she feels the need. School has been generally not obstructionist but has, down to an individual, met the notion of her having a cell with some suspicion that she would abuse the privilege. I simply insisted that she would not and in time they came to realize that she doesn't even see it as an "abusable" tool ... it's just part of her D bag.
Good luck. I hope you can modify their way of thinking
Mom to DD now 17, dx @4
G4 @ 15
"Happy Birthday, Dr. Banting! Now... let's eat cake! Because of you, we CAN!" - MCS