Hello Frnds,Well I have change my plan on Dec 1 from 512 unlimited to 849 Night Unlimited.I was using Night unlimited plan from last 1 year and was getting full 2MBPS speed.I had just change my plan for the month of november to 512 unlimited and mtnl babus locked my speed to 512 kbps.Now that I am back to my old plan from Dec 1.But still my speed is locked to 512kbps.After calling call center 1504 thrice those ppl are telling that we said its upto 2MBPS.So u can get any speed between 256 to 2mbps.Now I know that they have locked my speed to 512 kbps.Will they unlock to 2mbps on there own and how many days will they take ORDo I need to visit the exchange and get it updated after 100's of follow up which they require.CALL CENTER ppl are completely useless.Kindly Advice.Regards,Uchit Shah