Boards
If a friend of yours was being stalked and you'd obtained the stalker's mobile number from her, would you use it and how?
Also assume you have an extra sim card so could contact them anonymously and that your friend was happy for you to take any non-violent action you deemed appropriate.
For the purpose of this entirely hypothetical exercise we'll assume the stalker is someone she met once a few months back who's subsequently sent three texts a day (some describing accurately what she's doing at that moment) and has tried calling her from a variety of different numbers.
So what, if any, action would you take?