Yes, you can use your own modem with Xfinity, but it has to be on their approved list
Xfinity allows you to bring your own modem instead of renting theirs, but the modem must be on their approved equipment list. Not every modem works with Xfinity's network—the modem has to support the right technology standard and be compatible with their infrastructure. If you buy a modem that is not approved, Xfinity will not set up it on your account, and you will not have internet service.
The main reason to use your own modem is cost. Xfinity charges a modem rental fee each month (the amount varies by region, but typically ranges from $10 to $14 per month). Over two or three years, that rental cost adds up to more than the price of buying a modem outright. Once you own the modem, there is no monthly fee, and you keep it if you switch providers.
Key Takeaways
- Your modem must be on Xfinity's approved equipment list, which you can check on their website or by calling customer service.
- The modem must support DOCSIS 3.0 or DOCSIS 3.1 technology—older standards will not work with Xfinity's network.
- Buying your own modem saves you the monthly rental fee, which typically pays for the modem within one to two years.
- You will need to contact Xfinity to register your modem and have them set up it before you can use it.
- If you have a bundled service that includes phone or video, check compatibility before buying, because some modems do not support all services.
How to find modems Xfinity will accept
Xfinity publishes an official list of compatible modems on their website. You can search for "Xfinity compatible modems" or go directly to their support page and filter by your service type (internet only, or internet plus phone or video). The list shows the modem model, the DOCSIS standard it supports, and whether it works with all Xfinity services or only some.
When you look at the list, pay attention to what services the modem supports. If you have Xfinity internet and phone service, you need a modem that is approved for phone service—not all modems are. If you have video service, the modem must support that too. Buying a modem that only works with internet will not help you if you need phone or video activated.
You can also call Xfinity customer service at 1-800-934-6489 and ask them to confirm whether a specific modem model is compatible with your account. Have the modem model number ready when you call. This is the fastest way to avoid buying a modem that will not work.
DOCSIS 3.0 and DOCSIS 3.1: what the standards mean
DOCSIS is the technology standard that modems use to talk to Xfinity's network. Xfinity requires modems to support either DOCSIS 3.0 or DOCSIS 3.1. If a modem only supports DOCSIS 2.0 or earlier, Xfinity will not set up it, even if it is an older model that used to work.
DOCSIS 3.0 modems are older and less expensive, but they work fine for most households. DOCSIS 3.1 modems are newer and faster, and they support higher internet speeds if you have a plan that includes them. If you are buying a new modem, DOCSIS 3.1 is the safer choice because it will support faster speeds if you upgrade your plan later. However, DOCSIS 3.0 modems are still approved and will work with Xfinity as long as they are on the compatible list.
Steps to set up your own modem on your Xfinity account
Once you have bought a modem that is on Xfinity's approved list, you need to register it with them before it will work. Here is the process:
- Unplug your current modem (whether it is Xfinity's rental or another one) and disconnect the cable line from it.
- Connect the cable line to the input port on your new modem. The port is usually labeled "Cable In" or "From Wall".
- Plug in the new modem and wait for the lights to stop blinking and settle into a steady pattern. This usually takes two to five minutes.
- Call Xfinity at 1-800-934-6489 or use their online chat to tell them you are activating a new modem. Have your account number and the modem's MAC address ready. The MAC address is printed on a sticker on the back or bottom of the modem.
- Xfinity will register the modem and set up it on your line. This usually happens within a few minutes, and you should see internet service return.
If the modem does not connect after set up, restart it by unplugging it for 30 seconds and plugging it back in. If you still have no service after 15 minutes, call Xfinity again—there may be a network issue on their end or a problem with the modem itself.
What to do with your old Xfinity modem
If you have been renting a modem from Xfinity, you need to return it once your new modem is activated. Xfinity will stop charging you the rental fee once they confirm the return. You can return the modem at an Xfinity store, by mail, or sometimes by scheduling a technician pickup—the options vary by location.
Check your Xfinity bill or account page to see the return address or store locations near you. If you do not return the modem, Xfinity may charge you a non-return fee, which is typically $150 to $200. It is worth the small effort to return it and stop paying the monthly rental charge.
Modems that work with Xfinity but are not Xfinity brand
Popular modem brands that are on Xfinity's approved list include Motorola (ARRIS), Netgear, Linksys, and Technicolor. These are sold at electronics retailers, online marketplaces, and sometimes at Xfinity stores. Prices range from around $80 for a basic DOCSIS 3.0 modem to $200 or more for a high-end DOCSIS 3.1 model.
Before you buy, check the specific model number against Xfinity's list. Two modems from the same brand may have different model numbers, and only one of them might be approved. The model number is usually printed on the box and on the modem itself.
When you should not use your own modem
If you have Xfinity phone service, using your own modem adds a small amount of complexity. Your phone service depends on the modem staying powered on and connected. If the modem fails, your phone service goes down until it is fixed or replaced. With Xfinity's rental modem, you can call them and have a replacement sent or installed quickly. With your own modem, you have to buy a replacement yourself or troubleshoot the problem.
If you move frequently or think you might switch internet providers soon, renting Xfinity's modem may be simpler than buying your own. You do not have to worry about compatibility or reselling the modem. However, if you plan to stay with Xfinity for more than a year or two, buying your own modem almost always saves money.
Frequently Asked Questions
Can I use a modem I bought from another internet provider?
Not usually. Modems are built for specific network types, and a modem made for cable internet (like Xfinity) will not work with fiber or DSL providers. Even if it is a cable modem, it may not be on Xfinity's approved list. Check the model number against Xfinity's compatible equipment list before assuming it will work.
What happens if I use a modem that is not on Xfinity's approved list?
Xfinity will not set up it. You will not have internet service until you switch to an approved modem. There is no way around this—the network will not recognize an unapproved modem, no matter how new or expensive it is.
Do I need a separate router if I buy my own modem?
No. Most modern modems include a built-in router, so you get both in one device. However, if you want a stronger Wi-Fi signal or more advanced features, you can buy a separate router and connect it to the modem. The modem connects to the wall cable line, and the router connects to the modem.
How long does it take for Xfinity to set up my new modem?
Usually a few minutes to a few hours. Most of the time you will have service within 15 minutes of calling Xfinity. If set up takes longer, there may be a network issue or a problem with the modem itself. Call customer service if you do not have service after an hour.
Will I save money by buying my own modem?
Yes, if you keep it for at least one to two years. The monthly rental fee is typically $10 to $14, so a $100 modem pays for itself in about eight to ten months. After that, you save money every month until you replace the modem or switch providers.