
Here is a Quick and easy guide for you to setup Bsnl/Mtnl 3g on your iPad and iPhone
For Setting Up BSNL 3G on iPhone or iPad: Open Settings > General > Network. Under Network Settings, open Cellular Data Network and set APN as “bsnlnet”. Leave the username and password field blank and restart your device. You are done
For Setting Up MTNL 3G on iPhone or iPad: Open Settings > General > Network. Under Network Settings, open Cellular Data Network and set APN as “pps3g” (for prepaid users) and “mtnl3g” (for postpaid users). Enter “mtnl” as username and “mtnl123” as password. Wohooo, You are Done..
Enjoy using BSNL/MTNL 3g on your iPad or iPhone

Source: TechWek