I got this with the modem router with voice capabilities thinking I could use it with my phone but Spectrum told me I would have to use their modem for my phone to work. I called Netgear and they told me that wasn’t true but Spectrum kept insisting that they could not activate my phone unless I used their modem. Spectrum told me to get a splitter and use their modem for my phone and Netgear modem for my computer. That didn’t seem like a great solution so I kept the Netgear modem and I’m going with Community Phone for my landline. Netgear has really good customer service and the modem was pretty easy to install but if you’re looking to use the voice feature and you have Spectrum as an internet provider you will not be able to do it.

This is an expensive piece of equipment compared to other cable modems. However, it has all the features needed for Xfinity internet and voip service. Unlike my other cable modem it has a built in router. It also has two USB ports to allow the connection of a USB disk or a printer. It has both 2.4Ghz and 5Ghz wi-fi capability.Installation was relatively straight forward as fas as internet was concerned. I had to call Xfinity support to get the modem registered (MAC addresses etc.). Once that was accomplished it was up an running.The VOIP connection was more challenging as I was porting over an established number from another account. I was on the phone with a technician for about an hour before everything was working. Not the fault of the modem, but a function of Xfinity support competence. I feed my home telephone wiring with the modem and it works well. I have both wired and wireless phones and they all work. It does not work with rotary dial phones.Because the box has its own router it was relatively easy to make it work with my existing wi-fi system which are all Apple Airport boxes. I have previously had to use an Airport Extreme as a router since my old modem did not have one. Much easier to have the router built into the modem.Programming the modem is easy. You simply type in its address and use a menu driven setup. It gives you a lot of information about signal strength and signal to noise ratios. You can and should set your own passwords.I did not use the wi-fi although I tested it out. I already have several Airport boxes to cover my house from one end to the other and used the menu to disable the modem's wi-fi. In testing it worked well, but didn't have the range I needed.The USB ports are interesting. I hooked up a USB drive and followed the instructions. All my computers can see the drive and I can read from it. I still have not worked out the permissions for writing to the drive, but that's only a mater of time. Could be a useful feature to file sharing etc.There is a battery backup option available and I have one on order. It should allow my phone and internet to work even in a power failure (the phone system has a backup already).Al in all a nice piece of gear with all the features I needed.

If you have Xfinity Triple Play and want to get rid of the $10 per month rental fee, this is the modem you want. It looks exactly like the Cisco 3941T and has similar excellent performance, but has completely different software. While it's not as easy to configure as Xfinity's own modems, I do feel it is more secure.Installation was much easier than I expected. I disconnected the Cisco 3941T that I was renting from Xfinity and installed the C7100V. After plugging it in I followed the instructions in the manual and logged in to the router from my computer. It automatically opened a window to Xfinity prompting me to enter my Xfinity login and password which then updated my account to use the new modem, no need to call Xfinity as described in the manual. The modem did reboot and all the lights came on, but for some reason I wasn't able to get a connection from my laptop. I ended up rebooting the router again and everything came up correctly and I haven't had a single problem since. Voice quality is very clear and running a speed test over an Ethernet connection resulted in a download speed of 89.8 Mbps and an upload speed of 11.8 Mbps on my 75 Mbps service.This is definitely a speedy router/modem. It supports gigabit Ethernet, up to 600 Mbps over 2.4GHz, and up to 1300 Mbps over 5 GHz. The 24x8 DOCSIS 3.0 support also makes it future proof for much higher speed plans.WiFi settings are the same as other Netgear routers. It allows you to set up both 2.4 GHz and 5 GHz wireless networks as well as 2.4 and 5 GHz guest networks. You can also set up a white-list to only allow devices with a known MAC address to connect and block all other devices, even if they have the correct password. (On the Xfinity modem you can't do this, you can only have it notify you when a new device connects.)One of the downsides of switching to your own modem is you lose XFINITY xFi. xFi only works with Arris 1682G, Cisco 3941T, Arris TG3482G or Technicolor CGM4140COM modems rented from Xfinity and provides a simple interface for your network that can be viewed and controlled from the Xfinity web site, the Xfinity xFi app, or from your X1 box. What I liked about xFi was you could assign devices to groups and then easily view which devices were currently connected and how much bandwidth each group was using. You could also set parental controls for each group. One of the things I didn't like about xFi was it easily displayed your WiFi passwords. Additionally xFi doesn't allow you to set up a white list, you can only disable a device after it's already connected to your network. Using your own modem you also loose the Xfinity SSID which other Xfinity customers can use to connect to WiFi. While some aspects of xFi are nice, especially for those not familiar with configuring their own router, I don't feel it's worth the extra money you'd eventually pay by renting.