I have an iPhone and a Mac, so if my phone rings or I get an iMessage it also rings/pops up on my Mac. The other day my phone rang and the notification popped up on the screen which said something like "call from Mum on your iPhone in your purse". I didn't think much of it at the time, but now I'm wondering how did Apple know that my phone was in my handbag? The more I think about it the weirder it is.