Free callertune for uninor in kolkata. And try in your state. . just dial. . 522040. . and activate it. u can changeur tone by sending the song. . name to 52200.. . thats the only trick that u can enjoy.. Just deactive the callertune before 30 days and after get the deactivate sms, u call to 522040and activate in for next one month. And Enjoy unlimited.. Note- This trick is share by my friend . I have no uninor sim so Try at yourrisk.