How to use other sim in BSNL 3G Data card

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Those who reside in India BSNL is a well known cellular company, which offers 2G, 3G, Landline service. They provide 3G dongle to access the internet. However, only BSNL sim is supported on the dongle. If you use sim of different company, it will be rejected prompting an error message. Then how to use other sim in the dongle! All we have to do is to hack and tweak the windows registry. I wrote about the ‘Windows Registry’ recently (Read here). I will show the steps below to do that. See the screenshot to get a clear idea.

BSNL logo

STEP 1: Connect the BSNL dongle to your PC and install the software present on it.

STEP 2: Press ‘Windows key+R’ to launch the RUN dialog box. Type “regedit” and press ‘enter’. The registry editor window will open.

STEP 3:Then click on the triangle shape before the “HKEY_LOCAL_MACHINE” to open it. Then again, open “SOFTWARE” and select “Linktop3G”. (The full path is “HKEY_LOCAL_MACHINE\SOFTWARE\Linktop3G”)

STEP 4: Do not open the folder, just click on it. On the right side pane, you will see three keys. Double click on the ‘Engineer’ key and change the value to “0”, which was earlier “1”.

STEP 5: Close the ‘Registry Editor’ and reboot the computer.

STEP 6: Insert the dongle with a BSNL sim in it. Open the BSNL application and configure the access point to your desire. When done insert any other sim and it will be accepted without any error message.

However, remember you have to manually configure the APN (Access point) and active it. See below for some APN for different sim-providers.

Discrimination: I am personally using BSNL dongle for about 2 years with a Vodafone sim. Previously I was using Airtel and Reliance sim without any problem by using this method. My dongle’s model no. is LW272. Same procedure is to be followed for   LW273 model also.

Some APNs for different sim-providers. Hope you will find it useful.

Postpaid: APN: mtnl3g
Prepaid APN: pps3g
APN: aircelgprs
Access Number: *99#
APN: internet
Access Number: *99#
Access Number: *99#
Access Number: *99#
APN: bsnlnet
Access Number: *99#
Reliance 2G/3G
APN: rcomnet
Access Number: *99#
APN: portalnmms
Access number: *99#


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  2. Shraddha Sangewar · · Reply

    i followed all the steps for LW272 model for bsnl 3g.but i m not finding the path as is missing in software subparts.plz give me the solutions

    1. Ok if you can’t find the path then it is corrupted. Re-install the bsnl software, then open the registry editor. Go to HKEY_LOCAL_MACHINE by clicking the triangle next to it. Open Software-Linktop3g. Modify the value of engineer to 0. It is done. If you have any further doubt, then ask again and I shall send you an instruction with picture to your e-mail.

  3. bsnl sim not work for digisol data card pls how to work the sim

    1. Digisol data cards can be used with any sim. However in your case it is not working with a BSNL sim, right! Then you should enter another BSNL sim in it (to check it). If that sim works then your 1st sim is defective. If not then contact DIGISOL service center and get it repaired. However check if you have entered correct APN for bsnl. Create a manual connection profile. Put the values as follows;
      Name: BSNL
      Number: *99#
      APN: bsnlnet
      If your problem is not solved yet, contact Digisol service center. Good Luck

  4. but this process in not working in the window 7. there are no option of linktop 3g in hkey local machine/software. it is using the “program files” .not using “Program files 86″….. tell me how to use it on window 7… 64 bit

    1. If you use a 64 bit pc on win 7 you have to create the linktop3g folder in the wow6432node folder
      and add the Engineer binary value to it. Its value should be 0

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