I also have the same problem.

Hello
3G Modem is the best for using internet but you should know how to use the modem.

Thanks.

Check the settings.May be your area is not covered by the network .You can remove the settings from 3G only and check. it may be a hardware problem. Remove all the screw from the modem. Plug it to your system without any casing and then use your screw driver or any other metal to touch the four pins that soldered the USB port to the pcb.
It might also arise as a result of damage to the USB port connector on the modem. Take it to the handset repair engineer and ask him to help you heat it with his workstation.

the modem's only two months, there must be a guarantee, try to take it again just to counter immediately, as long as the warranty is still there, it would have repaired or replaced with new ones

I am also purchased this and I have same problem. :(

Hey if the problem still persists, you gotta try changing the sim panel. That's how it works normally. I faced the same issue and It was solved only when i tried changing the SIM panels. Try it and let me know if it works. Hotel Aida