Using Nokia router(Airtel) with Excitel connection

Simple answers would be no and yes. I do not think you can get an Excitel connection without paying for their device. And Airtel remotely manages all their routers these days. Bridge mode is supported if you file a request with Airtel. But that only allows you to use your own router after Airtel's router I believe. Not sure if you can even use Airtel without using their device though I imagine, there are ways that I am not aware of.

Is there any way I can connect Nokia router to my Excitel's router wirelessly (via WDS)?
I don't have any ethernet wire right now.

other that that I also have iB-WRA150N