My favourite thing about
under a couch
It would be too annoying
This will depend on the phone model and your phone carrier. You can call them to find out how to hide your number.
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maybe that have the phone call
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The best bet might be her handbag or bedroom drawers.
you can't really hide apps, but you can put them in a folder so they aren't obvious.
I would hide somewhere dangerous where they would be scared to go inside!
On many phones, in the settings you can hide you profile.
a developer program to make your phone hide system information
If i were you i would hide it up a tree or under a tree but if you already tried that then i would hide it somewhere people would never expect it to be.