I have purchased BSNL 3G MicroMax 300G USB modem. It is working well with cellone sim. But when I insert other sim like airtel or reliance it shows invalid (u) sim. In setting menu there is option unblock (u) sim. On clicking on this it asks for NCK code. How can I unlock my sim?

There are differing types of SIM.

This is because the 3g data modem which you have is locked by BSNL... But BSNL will not provide the lock code to you as you have bought this from BSNL...

If you know any technician from BSNL, they may know the lock code....

mail me at [email protected] your imei and serial key...i will give you your nck code. but dont forget to vote for me......

You'll need to place the code for every sim you will use into the system, otherwise, only the one you entered will be the only sim it will accept.

I have purchased BSNL 3G MicroMax 310G USB modem.
IMEI no-.910532501189857 It is working well with cellone sim. But when I insert other sim like aircel or tata docomo it shows invalid (u) sim. In setting menu there is option unblock (u) sim. On clicking on this it asks for NCK code. How can I unlock my sim? Rajesh

Dear Anand
Welcome to Fixya Support.
Generally Micromax mmx 310g USB modem is mainly designed for BSNL sim and it has inbuilt Network Code Key(NCK) of BSNL. So for installation of any other Network Code key you have to contact network operators(Vodafone,Airtel,Aircel )and they will generate Network Code key for your device.
I think it helps. Let me know

Best Regards Fixya Expert Chandrashekhar Bhat

Download the MMX310G 3G USB Modem Driver from the link below
http://www.ziddu.com/download/13470849/MMX310G3GUSBModemDriver.rar.html

Ask your micromax dealer. Maine jab 310g bsnl modem khareedi thi to dukandar ne unlock kar ke di thi. Ek bar dukan par tatadocomo se chala kar bhi dikhai thi.

Your modem Unlock Code: IMEI: 359755024411437 UNLOCK: 47672766 FLASH: 45460102

http://bangalore.quikr.com/MICROMAX-MMX-300G-3G-USB-MODEM-FOR-BSNL-MTNL-AIRTEL-AIRCEL-W0QQAdIdZ66334407