should be pretty easy for a telco to do (e.g. vodafone) as they have control over the software in many phones. There would have to be some method to prevent users from changing the time - which should be grabbed from the host anyway...

I just finished having a similar conversation with the cable company. I'm not getting much sleep chasing my teen around colecting cell phones and cable modems. He figures that if he can't talk on the phone, he'll watch tv. Parents are being held hostage by the tech companies, and paying for it. One rep in customer service actually said that I should applaude my son for multi-tasking when I told her that he used 6040 text messages in one month at school. Who is defining this culture of cell phone useres anyway? It's time for parents to take back control. I want to be able to have the utilities that I pay for controled by me and not my teen or the phone and cable companies.

I don't mean to get all luddite on you, but sometimes simple solutions work best: How about not providing your kids with cell phones (didn't seem to effect any of us born before there WERE cell phones too badly) and shutting down the cable if TV is being abused.

Just a thought.

The plume of radio waves within four inches of a cell phone is especially harmful to the growing children, and can be harmful to anyone with constant exposure. Keep em away from your bodies when not in use guys, and out of the hands of children! See (book)"Cell Phones: Invissible Hazzards in the Wireless Age" by George Carlo