Hey guys i have the basic tech knowledge about routers and their differences with modems...I wanted to buy a new router with Wi-fi capability so that i can occasionally use my broadband connection on a Wi-Fi enabled device or use my friends laptop. I zeroed in on Belkin Basic Router N150 but after further research i found that I would need a router with RJ11 port as i have a Reliance broadband connection which provided me with aUT Starcom UT-300R2 ADSL Modem which has a RJ45,RJ11 and a power cable port. So can i use the router i chose by simply replacing it with my old router?? Please ask me any more details which would be needed by you... i got lost while writing the description.. 
i also searched for router+modem on flipkart and i am thinking between these two: