GSM brand of Tata tele services, DOCOMO is introducing roll over plan for its enterprise customers. According to this plan, the remaining talk time of the month is carried forward to the next month and is valid for the three months. Customers can select from the four rental plans which come under this offer. Every month, the remaining talk time will be continued to the next month. Under this plan, rollover vouchers are available for monthly rental of 500, 799, 1000 and 1099 rupees. Per second billing is applicable for this plan also. The talk time which is brought forward by this roll over will have the validity of three months.