I have purchased BSNL 3G MicroMax 310G USB modem. IMEI no-.910532501352562. It is working well with cellone sim. But when I insert relience GSM sim 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? Kamal

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....

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.

how to unlock BSNL micromax usb modem 310g to use other sim.plz help me

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

Give me your modem IMEI number and I will unlock it.

the modem is sim locked... u cannot unblock it without the lock code... and the lock code resides with BSNL cz it doesnt want u to shift...