@ulysses
MTNL was giving 384kbps in 3G network till 2011 June. After all other players started giving 7.2mbps, mtnl got lot of pressure from users when they compared mtnl speed with others.
Hence mtnl activated hsdpa in all sims. Now they are facing problem of network slowdown as all users are on 3G HSDPA speeds.
Other players have capped speeds for users who have no 3G dataplans activated.
Example of Mumbai Prepaid 3G market:
Vodafone:
Buy 2G plan and 3G network is disconnected
Buy 3G plan and 2G & 3G network activated.
Airtel:
Buy 2G plan and 3G is capped with 2G speeds
Buy 3G plan and 2G & 3G network activated
MTNL:
Buy 3G plan and get 3G and 2G network
Or buy nothing and get 3G HSDPA activated at Rs. 1 per MB
This results in lot of 3G usage because price of 2G and 3G is same in MTNL