Things for Cable to notice about Storm's brain: she has a natural static field that protects her thoughts from surface or casual telepathic interference - 1 and 2.

She's also trained by Charles Xavier to forcefully push intrusive telepaths out of her mind via the red triangle protocol.

But she's also open to Nathan contacting her via telepathic summons! And she might occasionally try to psychically yell really loudly for him and see if he picks up lol.

I'm also open to device hacking (or device/data security) shenanigans!!