That business model is alive and well in Hungary. A single SMS was sent from my phone in August (nobody in the family knew anything about it, so we can only assume it was sent by somebody else who may have gained access to the phone while the kids took it to day camp). This SMS "authorized" three different companies to send me "premium SMSs", each of which cost $2.50 (roughly, converted to USD).
My phone's a prepaid, so this ran the balance down to the minimum $1.50 in short order, but I didn't know whether perhaps somebody in the family had simply used those minutes - so I recharged it with $50. In three days, it was back at $1.50 and it had done nothing but vibrate in my desk drawer occasionally.
The "premium SMSs" were sent as system SMSs so they wouldn't appear in my Inbox; if I hadn't noticed one or two I wouldn't have seen them at all. I thought they were simply SMS spam, not even knowing that a "service" like premium SMSs even existed. They seemed to include a URL and nothing else - on a phone that only supports Internet on GPRS, which is no longer even available in Budapest.
T-Mobile said that for privacy reasons, they can't divulge the identity of those companies. Of course, T-Mobile gets about half of the cost of each premium SMS, so it's not terribly surprising that they're not highly motivated to stamp out scams. I told them to remove my ability to enjoy the premium SMS service, and they obliged, but that's as far as they would go.
(Nothing against Hungary. Same thing happened to me once in America with 900 numbers; the only thing the phone company would say is that somebody must have plugged a phone into our outside service jack - we turned off 900 numbers then and made sure they were off for every subsequent landline we obtained, but a scam's a scam.)
I have no recourse under Hungarian law, incidentally. Since a subscription was entered from my phone, there's nothing I can do to recover that money. It's no great problem for me, but that's a lot of money to the average Hungarian, who is absolutely powerless against a big foreign company like T-Mobile.
Sometimes they are enabled without your permission. My mom's phone number auto-magically gets subscribed for 'premium SMSs'. She doesn't understand how to send SMS's and cant use the phone interface apart from dialing a few numbers. Yet she often complains of money getting deducted from her pre paid account.
Called the customer care numerous times and every time all we get is - 'We are sorry sir, may there was an error in our system'.
Needless to say these mobile company thieves make millions from these 'errors in the system'.