Mobile carrier NTT Docomo Inc. said Thursday it plans to review its two-year smartphone contracts by next March, a day after rival KDDI Corp. pledged to change its contracts in response to government warnings.For customers receiving discounts on monthly fees under the two-year contracts, Japan's three major carriers including SoftBank Corp. currently require subscribers to pay penalties if contracts are canceled before maturity or charges for extra one-month periods to end contracts shortly after 24 months.While two-year contracts are automatically renewed, subscribers can terminate them wi…READ FULL ARTICLE