D-Link DSL-2750U compatible with Tikona Broadband or not?

Hi ...
i have a Tikona Broadband at home with a RJ45 connector coming out from the signal device.
i have 1 desktop PC and 2 Smartphones.
I want to purchase a Router with 300 Mbps speed, with a USB port for Data card/External HDD.
After gone through various websites i have decided to go for D-Link DSL-2750U Wireless N ADSL2 4-Port Wi-Fi Router.
But it is a Modem + Router and has RJ11 WAN port But on various forum i have read that this product can be use with tikona broadband. But in Wajirpur Computer Market(Delhi) all shopwala told me that this D-Link DSL 2750 is a Modem + Router and will not work with Tikona Broadband. what should i do?
Is it compatible with tikona broadband?
can i go online simultaneously on my 2 smartphones and Desktop PC?
what will be the limitations of using Modem+router instead of a router (If it is compatible)?
Please suggest some other Routers with similar configuration, 300 Mbps(large home), USB Port for data card and external HDD.(i dont want to go for TP-Link).
My range is upto Rs 2500.
Please Help me out from this confusion.
Thanks & Regards
Ashwani

It won't work with Tikona out of the box. It will work if you're willing to put in the effort to flash it; steps given here https://broadband.forum/topic/75482-using-the-dlink-2750u-as-a-true-ethernet-wan-router/