BSNL , One of the BEST Networks in india giving 3G Speed on 2G Plans. Since BSNL have only 3g offers Now there is no meaning of having 2g speed on 3g networks .
The Speed above 4 Mb/s is Reported on Kerala.
The existing 2G plan experienced extreme increase in the Data Speed [ above 500 kilobytes/sec ]. Recent Plan Updates
Here is a Screenshot of speed test taken