Want to here something spooky about my 4s.

I occasionally use my iPhone to play music through the Aux socket in my car. Since upgrading from 3GS to 4S there has been an audible hiss during playback. There are 3 possibles, A. The headphone socket on the phone is kaput, B. The 3.5 mm cable is iffy, C. The Aux socket in the car is playing up. So I decided to start eliminating these. I put a reminder in my 4S saying"Try iPhone with headphones to test hiss". Later on I plugged in some headphones (all was ok), when I went into reminders to tick as completed the phone had already done it. Did it really recognise what I'd written and what I'd done. ?