I don’t think any glucose readers come with a bluetooth functionality. There’s one (or a few) that does NFC. The advantage of having a mobile phone is that it can also transmit the data to the clinical team, and the parents.

If the glucose reader came with bluetooth and a simcard slot (to share data), and a simple LCD screen to provide a simple glucose reading then I’d probably go with that. But there is nothing like that at the moment AFAIK.