ARRIS (T25) - Cable Modem - Fast DOCSIS 3.1 Gigabit Cable Modem , Comcast Xfinity Internet & Voice , Two 1 Gbps Ports, 800 Mbps Max with Xfinity Plan

I installed the Arris T25 modem about a week ago. It replaced an Arris Surfboard 6190. I bought the T25 to use Xfinity Voice which is part of my plan but which I never used. The modem has been operating since installation without any incidents. Internet download speeds went from 600Mbps to 900Mbps. The telephone line has performed perfectly.Installation was not as straightforward as I would have liked. Since I don't have an exceptionally strong cellular signal where I live I first tried connecting a laptop directly to the modem and using the Xfinity activate webpage from a browser. I got nowhere trying that. I always ended up back on a webpage that told me to download and use the Xfinity app on my smartphone. Despite the weak cell signal I decided to try the Xfinity app from my phone. Scroll down in the app to where it says, "Got new equipment to set up? Activate now." It worked fine. The app only asks for the modem's HFC MAC ID, not the MTA MAC ID. After a few minutes of watching the lights on the modem cycling the app reported that the modem was online and provided the telephone number assigned to it. That was it - internet working, telephone working, no call to Comcast required. I connected my Asus router to the modem and I was good to go.Update: A frequently asked question is whether the modem can be connected to extension phones in the home. The answer is yes. However, my first try wasn't successful. I connected the modem to a wall jack that's connected to all of the extension phones after first disconnecting the phones from my current landline supplier at their demarcation box. The phone light on the modem started blinking as if the line was in use, but it wasn't. The displays on my extension phones also showed "Line in Use." I disconnected the modem from the phone jack to think about what the issue could be. A few days later I tried again but this time thought to disconnect a printer/fax from its phone wall jack. All of the extension phones now worked perfectly. I'm not sure why the printer/fax would cause a conflict when it was not in use, but all of the extension phones are working fine now. I can live without the fax if I have to.Update March 14, 2024: I think it's helpful to update reviews after a product has been in use for some time. I've been using this modem for internet and phone since November of 2022, and its performance has remained absolutely solid. I have not had to reboot it once. Very happy.

Needed to up grade from my previous modem which was working well but getting a bit long in the tooth. The install was straight forward and pretty easy to activate my internet setup and connection....but trying to a get my phone activated was a real pain.Spoke with Comcast to verify my MTA and HCF mac address' and to get my dedicated phone line working, no problem. Comcrap wasn't able to get a dial tone after several attempts, so they suggested I contact the modem mfg. that it might be defective.So I called the mfg, they were very helpful with trying to help me resolve this issue, but in the end they said to just return it for a replacement, which I did.Got the second modem very quickly and installed it...same thing, no phone connection. Called Comcast and went through the whole thing again with them, they ended up telling me they were sending this to the next level of their tech support and would be back in touch in several days.....guess what, no call back after 3 days.Called Comcast back again for the 4th time and spoke to the first person from tech support that picked up the phone. Had a feeling this was going to go badly, but to my amazement she was able to do what 3 other calls to tech support couldn't, get my phone service, which is provided by them, connected.I can highly recommend the ARRIS T25, it is really easy to install, unless you have phone service from Comcast, it runs my max internet speed easily, is compatible with Comcast specs and will save you the $14/mo rental charge if you use a Comcast modem.Excellent product.... I hope this ARRIS model lasts as long as my previous one.A side note, this functions as a modem only with phone service, it's not a modem/router combo, so no WiFi. I use a separate router for my Wifi connections.

This looked like a great modem, and I saw many positive reviews. I was replacing my Netgear CM500V because Xfinity upgraded my speeds all the way to 800Mbps for no extra charge. I was wrong about the whole thing.I got it, activated it, set it up with my Deco M3 system and it worked fine for a while. The M3 never properly accepted the modem change, showing an offline status. But, since I was still able to use the internet with Ethernet (and mostly Wifi), I thought nothing of it.Later that day, phone calls would frequently have drop-outs mid conversation and other quality issues would spark randomly. Additionally, I finally noticed that Wifi was being troublesome and the modem page (192.168.100.1) would frequently time-out and not let me view it. It would take 10 minutes to load a single page, not great when diagnosing something.I tried reactivating the modem with Xfinity, many reboots and factory resets later, I finally gave up.Turns out after googling, these modems still have the dreaded Puma chipset from Intel! Of course Arris hides this and doesn't show that anymore, but they still put them in regardless. There was never any hardware update to fix these issues with this flawed processer.I returned it after four days of endless troubleshooting and am not gonna bother replacing my modem for a while. My CM500V is still giving me solid speeds and reliability; I just wanted the extra tiny speed bump I was paying for. Little did I know that it would cause such pain.