I think my smartphone is possessed

Guess you should have read that terms of use agreement closely before you skipped ahead and clicked on the “I Agree” button. You missed the whole agreement to host demonic spirits didn’t you.

I did not accept the terms myself, the planchette just moved by itself to Yes. I have been scammed!

No no no, what you do is you put the phone into a paper bag, swing it around your head, and you scream like a chicken.