Free Tata DoCoMo Night Calling 108000 Seconds Trick For Kerala! Tata DoCoMo Introduces Night Calling For its Users in Kerala! Details are given below: Cost - Rs. 14! Free Local Tata Docomo,Tata Indicom & Tata Virgin - 1,08,000 Seconds [ Between 11pm & 7 am] ! Validity - 15 Days!Enjoy!!!