now u can use 3g speed in 2g connection with tata docomo

1) activare 48 rs gprs pack

2) send sms {3GLIFE to 53333} or {ACT3G to 53333}

3} tata docomo will reply very late may be after 2 days after
     2 days u will feel ur speed increasing 

NOTE by javed:- u can get only 125kbps cause its free 3g

NOTE by javed :- send the sms only by a 3g phone 
                         otherwise u wont get the settings