For BSNL users its a great trick and tip coming hope you all will like this most and it will help you.
So people having BSNL 3G data card try to change their data card as they can not use other SIM in their data card.So they have to face many problems.But don't worry.It is possible to use other SIM in the data card.
For doing you have so to change simple setting in your registry.you have to do following steps .First you open the registry editor goto run by pressing Ctrl+R.
Now, you have to do is to change the value of Engineer key from 1 to 0.
It's almost done.
But, to access internet from any other SIM you have to do some connection setting in the BSNL 3G program.
Open BSNL 3G, go to the option of settings, in the connection menu click on 'add' and do the following settings.
Profile Name-Any
Number-*99#
User Name-your wish what you want
Password-according to your choice
APN-According to the SIM inserted, for example
APN of Airtel is airtelgprs.com
APN of Tata Docomo is TATA.DOCOMO.INTERNET
APN of Aircel is aircelweb
APN of Vodafone is www(small letters).