Come per i PC normali, anche per i cellulari esistono software per "spiare" le attività di un'altra persona:
Cell phone snoopware called Neo-Call now supports BLUETOOTH. After installing the software on a target phone, the software secretly and invisibly records all telephone numbers, voice recordings and text messages used on that phone, and also records the location of the phone when calls are made. Thanks to a recent update, the recorded data can be transfered to your phone via Bluetooth. What could possibly go wrong?
Fonte: Cell Phone Snoopware Now Supports Bluetooth