bsnl teracom lw 272 datacard unlocking trick 
 bsnl data card lw 272 from teracom comes locked and is impossible to use
 other network sims in it unless you unlock it. you have many advantages
 of unlocking, it allows you to use any network sim in it. so if you 
have some connectivity or coverage issue you can switch to other 
provider. same is the case when other providers start giving better 
tariffs. the unlocking is very simple and be done by anyone. it takes 
just few minutes. all you have to do is change the registry value of the
 teracom driver you installed on your pc. so if you use this lw 272 bsnl
 modem on different pc you will have to unlock it again. so the unlock 
is done on the pc, not on the modem. so there is no risk involved in 
unlocking the teracom lw 272 from bsnl.. this trick is 100 percent 
working. so lets unlock teracom lw272 modem that you got from bsnl. this
 step by step guide will tell you how to unlock bsnl teracom lw272 modem.
 
step by step free guide to unlock teracom lw272 modem from bsnl :>
1. make sure you have installed all drivers in the pc
2. go to start 
3. click on run (on newer version of windows you can type command directly in the search box in the start menu
4. type regedit and press enter
5. it will take you to a menu like this
 
 
 
 
6. now double click hkey local machine in the left pane
7. now double click software (which appears when you double click hkey local machine
8. now select linktop3g
9. once you select linktop3g in left pane you will have some data on right pane
10. change the engineering key to zero.
11. restart your pc. you are done
12. Your Unlock Is Done NOW you can use all companies card in your BSNL
modem.