Hi, I have a TP-Link TC-W9970 DSL router. As my ISP decided to terminate ADSL 
connections because "nobody uses that anymore", I have to look elsewhere. 

I tought maybe my computer tablet or cell phone could be of some help. The 
tablet support broadband/cell connection, I have direct internet (no wi-fi 
needed). Then I can connect the tablet to a computer USB port and the 
computer has now internet access. In fact the tablet is like a 4G USB dongle 
or modem. Please note, no wi-fi is accepted at home.

I tried something, I connected the tablet to the USB port of the TC-W9970 
router then I went to the config software (192.168.1.1). As you may guess 
it didn`t work but I have to say I don`t understand all these technical 
parameters like DHCP, subnet mask ....... Whatever, can I connect te router 
that way ?

I also have a TP-Link TC-W9980 DSL router. Again, no luck either.

If these 2 routers cannot do it, what TP-Link router could connect with the 
tablet / phone to get internet access ? That router only needs ethernet ports, 
no wi-fi.
 

Thanks for help / info