Yes, my wife's bill showed $9.99 for Premium Messaging. Verizon customer service told me basically what you have been told. The billing was from a service called Jamster, which may or may not be legitimate (they are widely accused online of billing for ringtones, wallpapers, etc., that are supposedly free). My wife never signed up for them, wouldn't have known how to sign up for them or wanted to learn, never sent them the text message supposedly necessary to subscribe. I don't know about the phone being hacked, but I strongly suspect that somebody did something like "signing up" a random selection of computer-generated phone numbers, in the expectation that some of them would be real cell phone numbers and would generate the billing. Something sleazy is going on, at any rate. This can't happen by itself.