Can I continue to use my ADSL router now that I have changed my ISP from Airtel to Reliance?

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Hello,

I have Beetel 450tc1 ADSL 2+ modem/router which I had been using with my Airtel wired broadband connection for WiFi access. Recently I switched services to Reliance WiredBroadband. Reliance is providing a direct cable internet connection with an RJ45 cable but my Beetel has an RJ11 slot. I am not sure if there is a way in which I can continue to use use the same modem. Some cable converter/adapter or something. Please suggest!

Thanks

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