By Internet Provider

Your internet provider decides two things that no product page can: which hardware is even allowed on your line, and whether you are paying rent every month on a box you could own outright. Both are worth knowing before you shop, and the second one is where the money is.

What your provider controls

• Whether you can bring your own equipment at all. Almost always yes, but the mechanics differ enormously. On cable you buy an approved modem. On Verizon Fios you plug your router straight into their ONT. On AT&T Fiber their gateway cannot be removed, but it can be put into IP passthrough so your router runs the network. On Starlink you enable bypass mode.
• Which specific models are approved, by speed tier. This catches people out: cable providers maintain separate approved-equipment lists for standard, gigabit and multi-gig plans, so a modem approved for your provider may not be approved for your plan.
• What the equipment fee is. Anywhere from nothing to about $25 a month depending on provider, plan and market.
• Which technology generation you need. Cable operators are retiring DOCSIS 3.0 hardware from their lists, and Spectrum ends DOCSIS 3.0 support entirely on 28 October 2026.

The rental-fee arithmetic, done once

This is the reason most people come to a page like this, so here is the method rather than a promise. Find the equipment line on your own bill. Divide the price of the hardware you are considering by that monthly figure. That is your break-even month.

Published figures vary and disagree, which is itself worth knowing: Allconnect lists Verizon Fios, AT&T, Frontier and T-Mobile at $0 for equipment rental, Spectrum between $0 and about $10 a month, and Xfinity's gateway as included with upgrades from around $15 — while other reporting puts Xfinity's standard modem-and-router charge at about $15, or about $25 for its xFi Complete mesh service, and Spectrum's Wi-Fi router at about $5. Fees move with plan, promotion and market. We give the range, cite it, and tell you to read your bill, because the line on your bill is the only number that applies to you.

The one mistake nearly everybody makes

Plugging your own router into a gateway that is still routing. You then have two routers in series, both handing out private addresses — double NAT — which breaks port forwarding, some games, some VPNs and some smart-home remote access, and adds latency for no benefit at all.

The fix is to return the gateway, or put it into bridge mode so it behaves purely as a modem. On AT&T Fiber the equivalent is IP passthrough; on Starlink it is bypass mode. And in every case, turn the gateway's Wi-Fi off afterward, or its radios will compete with your router's in the same building. The modem, router and gateway distinction explains why this matters.

Cable, fiber and satellite are three different situations

Cable — Xfinity, Spectrum and Cox. You can replace the modem, the router, or both. The modem must be on the approved list for your speed tier, and must be DOCSIS 3.1 or better. Modems that appear on all three providers' lists are the safest buys because they survive a change of provider.

Fiber — Verizon Fios and AT&T. The ONT does the modem job and is provider-owned, so you are only ever replacing the router. Fios is the easiest case of any provider on this site: your router plugs straight into the ONT. AT&T is the most awkward, because the BGW320 authenticates and must stay.

Satellite — Starlink. No rental fee, because the router comes with the kit, so the case for your own hardware is entirely about coverage on what is usually a large rural property. Bypass mode hands the network to whatever you choose.

If coverage is the problem, this is the wrong section

Replacing gear at the entry point fixes speed near the box and fees on the bill. It does not fix a bedroom at the other end of the house. If your wired speed matches your plan and only the far rooms are poor, start at find and fix dead zones, then your house shape or mesh sizing. No modem purchase will change it.