Unlock BSNL 3G Modem, Use BSNL 3G Modem with other service providers
BSNL 3G modem (teracom lw272/lw273)comes with software lock. ie their is a setting which tells the software not to allow any SIM other than that BSNL. This setting is nothing but a registery entry with respect to the software. This setting is available at the registery location "HKEY_LOCAL_MACHINE\SOFTWARE\Linktop3G" with the name "Engineer". By default, after installation, the value of this registry variable will be 1. With this value, software will not allow any SIM other than BSNL. Inorder to use other 3G service providers, change the value of the variable "Engineer" to 0.
This will enable the software to accept SIM from other providers. Now for connecting to other service providers like IDEA, AIRTEL, AIRCEL, Tata DOCOMO, Vodafone etc, insert the sim, add the apn for the respective provider and click connect.
1) Copy paste the below listed lines on notepad and save as "UnlockBSNL.reg" and then double click. Select yes if windows asks for permission to edit/modify registery entry.
Windows Registry Editor Version 5.00
Download "UnlockBSNL.reg" and then double click to change the setting.
1) Registery window showing the updated setting
2) Settings>Connection window in the software, where APN for TATA DOCOMO is added and set as default connection for connecting to internet