Jamster!, a provider of mobile content, is offering a new service that allows parents to enter a mobile phone number to prevent content from being downloaded to that phone.

Jamster! has received quite a bit of attention in the past for being both widely successful and widely controversial. Youths know the company as a frequent advertiser in magazines and on MTV in Germany. Parents know the company because of the charges that regularly show up on the phone bills they pay for their children. The company was sued earlier in the year for allegations of signing consumers up for monthly subscriptions and recurring charges without proper disclosure.

Jamster! Guardian should go a long way toward answering the critics. Parents should always discuss the cost of purchases, whether mobile or fixed, with their children, but this new service gives parents additional control. The service should be offered in the UK this week and will be rolled out in other countries before the end of the year.