mtnl 3g settings

I just bought a Trump connection and activated 3G on it, and setup my phone using these settings:
APN: gprsppsmum
user: mtnl
But i am not able to browae with 3G speed. Please help.

3G SETTING (PREPAID)
Profile name: mtnl
Dial up no. : *99#
User name : mtnl
Password : mtnl123
APN : pps3g


3G HSDPA SETTING (PREPAID)
Profile name: mtnl
Dial up no. : *99#
User name : mtnl
Password : mtnl123
APN : ppshsdpa

• Opt for a 2G Dolphin plan from between the existing plans.
• Dial 1503(Toll Free) or send SMS ACT 3G on 555.
• One time activation charge of Rs.149/- will be charged in the bill for 3G services.
• Voice call will be charged as per opted 2G tariff plan .Video calls will be offer at a standard tariff .
• Opt any of the Data packages depending on data download.

If you are a existing dolphin customers:

* Dial 1503(Toll Free) or send SMS ACT 3G on 555.
* One time activation charge of Rs.149/- will be charged in the bill for 3G services.
* Voice calls will be charged as per opted 2G tariff plan. Video calls will be charged at a standard tariff.