Want to use cable modem cg3000d as a vpn wireless with my dsl

Hello,
I have quest dsl internet service. in the rural area i live it's the best i can do. I have a leftover netgear CG3000D cable modem. can I use that netgear somehow to wifi my home for my android phone, using the quest net service?
My knowledge of networking is less than 0..

update.. I found a thread dealing with this issue...guess i should search first then ask....