Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: Can I use this alone without a modem?
Document: I took it out of the box, plugged it in to the power/modem/PC, and it worked/is still working without a problem. The wifi signal is strong enough for all the wireless devices to get great reception in my house. Nothing really bad to say about this wifi router other than it felt pretty flimsy and cheap, but it's only 20$ so that's to be expected. It's basic and straight forward so if that's what you're looking for then this is what you need.Pros: Low price, simple, effective.Cons: Nothing
I was weary at first buying such a cheap router, but this wonder has won me over. Our cable modem/router had terrible speeds over wi-fi, and it's range was laughable. The TP-LINK router delivers the same speeds as wired, with only a negligible decrease, and it's range is outrageously good. Sitting in our dining room, the signal still gives 4 out of 5 bars ~75 feet away in our exterior garage. Sometimes my phone even connects from a block away. It took a bit of tweaking to get it running with our modem, but now it works without a hitch, delivering better performance than any router I've had.
Time warner was charging us $10 in wifi fees and modem rental fee every month( wifi fee?? ?..they are nuts) they were providing a cable modem with built in wifi but range was so short, i had to invest in couple of repeaters just to get wifi on second level.I purchased ARRIS / Motorola SB6121 for cable modem, and bought this router for wifi. For the price i was not expecting anything solid but so many positive reviews made me go ahead with this purchase.I am glad i bought this router as not even without the repeater i have strong signal not only in second floor but also the attic in the third floor gets strong wifi bars.This is a solid wifi router.
Wonderful device works great with Motorala cable Modem in TWC network. Coulld connect multiple devices phones, Roku, Laptop without a glitch.
Excellent product, good size, signal broadcasting facilities allows a wide margin, all electronic equipment work without sign problems, I recommend it for use in home
I got this for around $20. Reaches every corner of my 1800 sq ft townhouse. I've had Netflix 1080p streaming to two TVs at once without a hiccup. Speed test reaches 50mbps on my iPhone (I have Comcast Xfinity, maximum speed only 50mbps, so who knows how high this could have gone). Easy to setup... it's not Apple Airport, but if you are even a little tech-savvy, you'll have an easy time with this. It's proven reliable. We bought a second one for church, and use it on a private network to stream 1080p video from a Macbook Air to an AppleTV 3rd Generation.
This is a pretty good router. Better that the one from my cable modem. I use them together and set up 2 wifi networks. Works just fine!
Using the included disc, installing the router was pretty easy (though I had to call Comcast Tech support to use it with their modem, which was not fun).Overall I am very pleased. 5 stars.
I have a Modem/Router combo from my DSL provider. Before purchasing the TP-LINK router, the DSL provider's modem/router combo provided a slow WiFi experience with drop issues. I still have the DSL modem as it's required by the DSL provider, but I turned off it's router/wifi capabilities and now use this TP-Link router for WiFi... Like I said - HUGE IMPROVEMENT!
My Comcast modem/router is behaving badly -- dropping connections and giving so-so signal strength. I bought this item but had my doubt -- I do not plan to use it as a router, more like a repeater. Not sure if it is going to work. I plugged in an ethernet cable to its WAN port (NOT directly from Comcast router's WAN port, an ethernet router is behind that), then connected my laptop to one of its 4 LAN ports. The mini-CD was in place and autorun started.
Answer: Technically, yes, you can use this device without a modem.  This device will not, however, provide access to the internet.  If you have several devices that you want to all talk to _each other_ then this would do that.  I suspect you mean, "Can I use this device to connect to the internet without a modem" then then answer is no..It's a subtle and somewhat technical difference, but it might help someone in the future...