Phone CGM at school
If your CGM sends readings to your phone, that phone is medical equipment, and a blanket phone ban has to make room for it.
You are allowed to have your phone with you at school to see your glucose. If your continuous glucose monitor sends readings to your phone, that phone is medical equipment, and a school that blanket-bans phones has to make an exception for you.
- A CGM (continuous glucose monitor) is a sensor on your arm that sends your glucose to a phone or reader, so checking is a glance, not a finger-prick.
- In England this belongs in your individual healthcare plan, the written agreement between you, your family and the school about what happens day to day.
- The plan should say you can check readings in class, treat a hypo (glucose too low, usually below 4 mmol/L) where you are, and keep your kit close.
- Nobody at school has the right to confiscate a phone you need to stay safe, even during an exam.
Why the phone is not just a phone here
Schools have phone rules for good reasons, and most of those reasons have nothing to do with you. The problem is that a blanket “phones in lockers” or “phones off in lessons” rule sweeps up the one phone that is showing someone whether their glucose is dropping.
When your CGM reads to a phone rather than a separate handset, that phone is doing a medical job. It is not a special favour to keep it out, it is the same as another pupil keeping an inhaler in their bag. The way this gets made official, and stops being a fresh argument with every supply teacher, is by writing it down in advance.
Get it into the healthcare plan, not into a corridor argument
In England, schools have a legal duty to support pupils with medical conditions, and the tool for that is an individual healthcare plan. It is a document that names what your condition needs during the school day: where your hypo treatment lives, who knows what a low looks like, and, for you, that you carry and can look at the phone your CGM reads to.
Ask for the plan to spell out the phone specifically. “Reasonable adjustments” as a vague phrase does not stop a teacher who has never met you taking the phone off you. A line that says this pupil’s phone displays medical data and must stay with them does. The plan should be reviewed each year, or sooner if your kit changes.
Exams, cover teachers and trips are where it slips
The times it goes wrong are the times the usual staff are not there. An exam invigilator, a supply teacher, a trip leader from another school: these are the people who do not know your face or your plan. That is exactly when a phone gets taken.
Exams have their own rules for this. Access arrangements can allow a diabetes kit and a CGM in the room, and there are ways to handle a phone that only shows glucose, but this has to be arranged with the exams officer well before the day, not sorted out at the desk. For trips and cover, the fix is the same: the plan travels with you, and someone responsible knows before you leave that you check a phone for glucose. It moves during activity in both directions: gentle activity like a lot of walking tends to lower glucose and can bring on a hypo during it or straight after, and hours later including overnight, while a short intense burst can raise it, so a trip on your feet is exactly when you want to be able to look.
What changes how this plays out
The statutory duty and healthcare-plan templates described here are for schools in England. Scotland, Wales and Northern Ireland have their own arrangements that do the same job under different names. And if your CGM reads to a dedicated handset instead of your phone, the argument is simpler, but the principle is identical: the device that shows your glucose stays with you.
How it looks in practice
Examples, not instructions or doses.
You glance at your phone under the desk and see 4.2 mmol/L with a down arrow. Because your healthcare plan covers this, you can treat it there without asking permission or explaining yourself to the teacher mid-sentence.
Someone covering asks you to hand your phone in. This is the moment the written plan earns its place: you can say it is in your healthcare plan as medical equipment, and the office can confirm it.
You walk into an exam and the invigilator points at the no-phones sign. If nobody flagged your CGM to the exams officer beforehand, this becomes a problem at the worst time, which is why it gets sorted weeks ahead.
You are three hours into a museum-and-park trip and covering more ground than a normal day. Being able to check the phone tells you your glucose is drifting down before you feel it.