I have read it and linked to it because it is actually happening. You suggested its a 'no-no', which is definitely not the case.
I think you may believe I want the patient to carry the phone, but I am suggesting the nurse.
My father worked in Public health for 40 years, two decades ago we explored the idea of cards such as this for patients, but came to the conclusion they fell short for a variety of reasons, including patients losing the devices, patients transferring to different clinics and not having their original card etc etc. As is the case with current medical records, there is a stronger guarantee the doctors will be able to review existing case history is the data and files are stored with the hospital or care provider, not receiver.
Finally, I am pretty sure the nurse can charge a phone daily.