ARRIS SURFboard T25 DOCSIS 3.1 Gigabit Cable Modem, Comcast Xfinity Internet & Voice, Two 1 Gbps Ports, 2 Telephony Ports, 800 Mbps Max with Xfinity Internet Plans,Black

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.

I bought this modem as a replacement for an Arris cable modem I already owned. This model is supposed to support newer DOCSIS standards and have faster throughput. And, it is supposed to be compatible with the Comcast Triple Play services including phone. I have had nothing but trouble with this device since I installed it. Once a week it loses connection so you have neither internet access or phone service. This is corrected by rebooting the modem. The next week it happens again. I originally contacted Arris about this problem and was told by their technical support that there was a problem with the signal strength from Comcast. I put up with this for four months and the same problems continued. I called Arris several more times and was told the same thing each time. They denied any problem with the modem. Finally, I contacted Comcast and had a service technician come to my home and look at my setup. He checked everything and found no issues with the signal strength. His comment was the Arris technical support people were misunderstanding the status report which you can get from the modem. I contacted Arris again and told them about the Comcast service visit and the results. They finally agreed to send me a new T25 replacement. I received the new unit in about a week, installed it and then waited to see the results. Unfortunately, the exact same problem persisted. I tried to contact Comcast again to get a return visit from a service technician but was told since I own the modem they would charge me for a service visit. I decided to wait. Since that time I have researched the problem on the web and discovered this is a well known problem with this modem. No one knows whether it is a Comcast compatibility problem and or an Arris problem. But, both companies are pointing fingers at each other and customers are stuck in the middle. I still have this problem and cannot find any resolution. I am considering purchasing a different cable modem. DO NOT buy this cable modem if you want to use it for Comcast service.

*** Update 3 *** stability has been consistent since my last update below. I am more inclined to recommend the modem now for someone looking to get of rental fees with their ISP. *** Update 2 *** After reaching out to Comcast most recently (Nov 2020) I found that they installed a new mainline. Modem has become more stable and has not dropped as previously experienced. Will update should things revert *** UPDATE *** May 2020 - the T25 has started to go off line late at night. This requires a power cycle in order to restore connectivity. This latest issue, coupled with the Tel Line Port 1 resulted in a call to tech support. The 1st thing Arris brought to my attention was the modem was out of warranty. Interesting seeing as I have only had it for 3 months. They requested Proof I’d Purchase which I provided. I then waited for a response and received none. When I emailed them to follow up they replied that I needed to call them again. 2 attempts and waiting on hold for over 15 min with no contact. At this point I DO NOT Recommend Arris products. Reliability and non responsive support have earned 1 Star. —————————— For now, 3 Stars. Out of the box straight forward. Connect Cables and power up. Comcast was needed to provision. Not certain where the issues were but the online activation failed. Once provisioned phone line did not work. Waited a day and activated again online (this time it worked) and phone was now online. 4 days later phone would ring but line was dead. After 1 hr of troubleshooting switched from line 1 to line 2 port and problem fixed. If line 2 starts to fail, then it becomes a bigger issue. Speed wise, this is handling 950 Mbps with no issues. Will post updates if any major changes occur.

I've had this modem for a couple of months now and it has been performing great, consistently able to get the maximum bandwidth for my plan from Xfinity (350Mb/s). (I'm sure it will perform to deliver gigabit speeds if the internet plan allows that as well, but I just haven't personally seen that.) No outages*. It was very easy to install, just hooked up the coax cable from Xfinity to it, and the Ethernet cable from it to my router. I started on the Xfinity web app for finishing the provisioning and set-up but unfortunately Xfinity had some bad data on my account, the app showed a modem that was from years ago, not the one I was replacing with this, so it kept throwing errors when I tried to go through the steps to provision the new one. So I did have to call Xfinity on my phone and complete the provisioning that way. It was quite easy, just 5 minutes on the phone, gave the tech the cable modem id number and it was up and running shortly thereafter. (*) I am giving this 5 stars despite an initial couple of glitches with it. In the first 2 days that I had the modem, it twice turned off by itself and, strangely, would not turn on again until I disconnected all cables, and then reconnected them, and then turned on the power. (Until I disconnected the cables and reconnected them, simply trying to toggle the power caused the LED lights to flash a few times and then stop.) This was very annoying but it only happened those two times and has not happened at all in all the time since then that I've had the modem and it has performed with rock-solid stability. I'm not sure what those glitches were caused by, possibly some provisioning issue at Xfinity still settling down? Or else just a total coincidence and some other event (power spikes or static discharges somewhere happened at those times? Regardless, since it has been performing without any problems at all for an extended period now, I feel sure enough to give this a 5-star rating.