On the real compatibility of Dexcom

Hi, I wanted to know if someone knows a really compactible mobile list with Dexcom applications.Especially with the Follow application since I have tried mobile phones that are not on the list and seem to work.I say it why I have the little one with diabetes and I would like to buy a small and more or less current mobile that works for all applications

@Desinope

On the Dexcom page you have info of all compatible mobiles.In case of doubt you can also call them.I use iPhone with DG6 for almost three years and it works perfectly.
I also like small mobiles and bought an iPhone is second generation.It was well price, compared to the rest of the iPhones, it is small, ancient standard size of iPhone, good chip quality, and works perfectly.And I connect it with Iwatch where I see my glycemia.
That is not the last thing for photos and videos.But that is something that doesn't interest me, really.

All the best