While I was on the landline phone getting my mobile reconnected (I was late with the bill) I noticed when I pressed a button on the mobile, my mobile beeped and I could here a beep coming from the customer service persons computer on the landline. They must have full remote access to your phone. Which makes me wonder how safe they are against hacking?
Nasty. If you have a smart phone should be easy enough to find and disable. I stuck a custom firmware on my N900, that'll sort those buggers out!