DoCoMo was so far the least competitive company when it comes to provide unlimited data plan in Japan. But this my friends will change March 15 and you will finally be able to get a cheap and unlimited flat-rate in Japan for your smartphone and/or your tablet.

Both offerings will give customers a choice between two-tiered or full flat-rate billing to suit their data-usage habits. The two-tiered option lets users pay as they go for moderate data usage up to a set limit, or pay a flat-rate monthly charge of 5,985 yen (including tax) if they exceed the set limit. Under the full flat-rate option, the monthly charge is 5,460 yen (including tax) regardless of data volume.

As a special offer, DOCOMO customers who purchase selected smartphones or tablet PCs and subscribe to one of the flat-rate billing options will receive discounts on their monthly charges for up to 24 months. Also, students and their families who purchase DOCOMO smartphones and choose to use the flat-rate data billing for smartphones will receive additional discounts of 525 yen (including tax) on their monthly charges for up to 37 months.