Can you use your own modem with your ISP?
It depends on the provider — and the answer is on their own site, usually buried. We track 36 US ISPs: 16 publish an approved-device list, most others publish technical requirements, and 2 don't allow customer equipment at all. Every answer below links the ISP's own page.
Pick your provider
Why it matters
Most cable ISPs charge a monthly fee for rented equipment and publish that fee on their own pricing pages. A compatible modem you own is a one-time purchase — over a typical contract, owning usually costs less than renting. The catch is the word compatible: buy a device your ISP doesn't support and it won't activate. That's the whole reason this site exists — every page starts from what the ISP itself publishes, not from a retailer's claim.
How we verify
Every page cites the ISP's own policy page and states when we last read it. Where the ISP names specific devices, we list those exact make/model strings. Where it doesn't, we say so instead of inventing a list. Full detail: methodology.