If you want to inquiry about any BSNL residential number, then it`s link below
http://dq.wdc.bsnl.co.in/bsnl-web/residentialSearch.seam

And if you want to know about details of any reliance number, there is below link.But unfortunately it is provide now only surname or First name.

http://myservices.relianceada.com/captureInstantRecharge.do