Did your internet service provider givee you internet via phone line? If so, it won't work because this is a router and it can only be connected to an Ethernet cable to get internet. If your internet...

The TL-WR902AC may have compatibility issue with the 3G modem, so it may not be able to work with your modem. But as you mentioned, your modem is identified on the TL-WR902AC, you may try to check...

You may send am email to their Tech Support department to let them check it out.

If you are still with your parents, you may do more tests to check whether it's the settings on the C5400 which causes trouble. It is not right for the router to act like that. You may contact...

If you change the IP on the VR900, you will need to use the new IP to log in to VR900. After you change the IP, and disable the DHCP server, you may not be able to log in the VR900 if the connection...

What's the hardware version of your VR900? On the V1, it has WDS function which can change the router to extender, but this function may not work well sometimes. For V2 and V3, they don't support...