The Internal Affairs and Communications Ministry will force mobile operators to unlock handsets so they can function in other mobile operator networks, The Japan Times reports, citing unnamed sources. The ministry plan to submit the plan to a panel and map out details by the end of the fiscal year. In Japan, subscribers can purchase discounted phones and tablets with a contract tie-in period. The subsidy is recovered through a higher monthly plan. Operators sell SIM locked devices in an attempt to prevent users from switching carriers. Back in June 2010, the ministry set guidelines for removing SIM locks. However, the measure was not obligatory so it had little effect. The ministry now plans to drastically review the guidelines, the sources added.