Vodafone K.K. has begun unilaterally terminating services for prepaid mobile phones that have been used in fraudulent billing and other crimes, company officials said Tuesday.

The Liberal Democratic Party and its coalition partner, New Komeito, plan to submit to the Diet a bill requiring users of prepaid mobile phones to provide personal identification documents at the time of subscription. But the measure is unlikely to enter into force until next year.

Vodafone's move will serve as a stopgap crime-prevention measure until the prospective law comes into effect.