If you want to activate 3G in Tata Docomo prepaid SIM then you should have two things.Those are Tata Docomo SIM and 3G enabled Handset.Tata Docomo says “3G is Simple” but it is true because you don’t need to buy tata docomo 3G sim normal 2G is more than enough.
To enjoy 3G you just need to send a single message which format is given below:
SMS 3G LIFE to 53333
When your message is delivered to them then you will get confirmation message says 3G service is activated on the number.With it you will also get WAP Push for the accessing the 3G.
Now enjoy Tata Docomo 3G.Make sure you have selected the network mode UMTS or HSDPA to enjoy 3G speed.