Blackberry Smartphone as a Tethered Modem GSM

[weapon-x 3]

Hi guys i got BB 8830 with BSNL connection , i got the APN setting of BSNL and installed Opera on BB , now i can access internet on BB f9 ,, but when i try to connect it via USB to tethered as modem i got error connection failed..

SO let me tell me what i used..

1. Got Blackberry DM v6

2. Used BSNL as profile

3. BSNL apn : bsnlnet

Result connection fail.

then i try with DM v5 , made a connection

1. no to dial : *99#

2. Blank username and password

Still got error , guys plz help me out ....