Fate only smiles like that to Nanoha.
That said, it bothers to me that now they're using plain smartphones to communicate, instead of just using their devices with a holographic screen. They're also both capable of long range telepathic communication, but I think Tsuzuki forgot about that more than a decade ago.
Spoilers for next chapter: Or maybe it was the easiest way the author found to have Nanoha, Fate and Hayate to keep in contact with their childhood friends, by using Instagram.