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AT&T USBConnect Momentum (Sierra 313U) 3G/4G USB - Refurbished, Like New
No Contract Upgrade

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Item Number: 3859
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The Refurbished Momentum is not currently available. See the 340U Beam as an alternative.

This refurbished no-contract modem is "like new" and is perfect for existing AT&T customers who want to swap to a more current device or need to replace a lost/broken device, but don't want to alter their contract (purchasing this device will NOT extend or alter your AT&T contract - once you get the new device, simply swap the SIM card from your old device to the new one). This device can also be used for AT&T's month-to-month service (you will need to contact AT&T after receiving the modem to sign up for service and acquire a SIM card). *the 313U has a standard-sized SIM slot - if you plan to use a microSIM, you'll need the micro-to-standard SIM adapter

You may need the AT&T Communication Manager to activate your modem - if you don't already have it installed, you can download it from AT&T's website

Refurbished devices fall under 3Gstore's standard 30-day return policy (read more at There is no manufacturer's warranty on refurbished devices.


  • USB connection: Compact modem plugs directly into your laptops's USB port.
  • 4G LTE/HSPA+: Take advantage of the nation’s fastest mobile broadband network that’s getting faster with 4G. (where available)
  • Plug and play: Installation is quick and easy using the helpful setup wizard.
  • Expandable memory: Includes an expandable memory slot that supports microSD™ cards up to 32GB in size.
  • GPS capability: Access maps and other information about your current location from your laptop.


  • Frequency - GSM/GPRS/EDGE: 850/900/1800/1900; UMTS/HSPA+: 850/1900/2100; LTE: 700/AWS
  • EDGE high speed data network - capable
  • Dimensions - 2.6 x 1.02 x 0.51 inches
  • Weight - 1.06oz
  • Antenna - Built-in antenna and external antenna port (external antennas sold separately)
  • Supported OS - Microsoft® Windows® 7, Windows Vista®, Windows XP SP3 and Mac® OS X (v10.5 or later)

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All Reviews (5)

Only customers who bought this item from 3Gstore can write a review - these are all verified 3Gstore purchases

Date Added: 06/08/2015 by Eric H. (Lakehills, TX)
This is now a fairly old piece of equipment, but it works fairly well. With my AT&T Unite Pro (Netgear 781S) attached directly via USB, I can get up to 75Mbps down. But with this 313U, I top out around 35Mbps because it lacks some of the newer features bonding additional channels to increase throughput. That said, it's very straightforward and easy to use and much more widely compatible with various 4G routers than the newer 781S. Plus, this is just a modem, compared to hotspots like the 781S that are their own integrated router/firewall, and you have no way of truly disabling or bypassing it. The AT&T communication management software for Windows that it forces you to use is probably fine for your average user. But for power users who don't want or need its features and restrictions, just want it to work directly, I recommend upgrading to the AT&T Global firmware It's available at

Date Added: 06/05/2015 by Chris S. (Oxford, FL)
My only real criticism of this modem is that it is NOT platform-independent or plug-and-play. On an individual computer, it only works under Windows, with its self-installing "Connection Manager" software. With a router, it requires a special router that knows how to pretend it's running the same. Even routers which claim to support failover to 3G broadband (Asus) won't work. That said, it's great once you get it working. AT

Date Added: 02/18/2015 by Michael K. (Wagner, SD)
Works as promised. Love having the ability to connect an external antenna.

Date Added: 10/26/2014 by Robert M. (Phoenixville, PA)
Every great once in a while you run across a vendor who puts customer service above sales AND has people answering the phone who actually know what they are talking about. I had a Cradlepoint MBR95 router with an AT&T beam modem connected for use at a remote area vacation home. All worked well for a month until one day I used the Beam on a laptop down the street. I noticed I was being offered a firmware update and made the upgrade. When I returned the Beam to the router they would no longer connect - automatically or manually. After some time on the phone with an AT&T tech he admitted to being stumped. A call to Cradlepoint found that I would have to pay for technical service. After a number of hours searching the net I found someone who had written an article stating that once the firmware was updated on the Beam it was no longer compatible with the Cradlepoint MBR95 and that there was no way to revert the Beam to the previous version of the firmware. That link lead me to the 3G Store where a call to Kevin advised me that he was well aware of the problem which he then proceeded to explain to me in language that I could easily understand. Thinking I would need to buy a new and expensive router as I had 23 months left on the Beam contract Kevin instead suggested my getting this older-model refurbished device and just swapping out my sim card. He assured me that it would resolve my problems. Upon receiving the modem I swapped the sim card and the 'new-old' modem synced right up with the router automatically. An added bonus is that over the past month my remote site connection has been far more stable than it had previously been with the Beam modem. I have now purchased several more items from the 3G Store instead of a vendor I had previously dealt with simply because of their great customer service combined with their excellent and friendly technical service.

Date Added: 08/28/2013 by Ken N. (Auburn, CA)
Paired this up with a Pepwave SOHO in an RV. It is working well including under 4GLTE. Have Pepwave setup to use Wifi first, the fall back to this USB cell device when no Wifi is available.

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Questions & Answers

Will the 313U work in a Cradlepoint MBR95, if so, how does one set it up?
I have an activated SIM in my iPad, can it be used in this 313U USB modem?

Sierra 313U/ USBConnect Momentum Manual Download installation guide/manual

Purchasing this product gets you access to the following exclusive 3Gstore resources:

Sierra Wireless Gaming Tip Sheet 09/22/2015
Sierra Wireless Ping Test Tip Sheet 09/16/2015
Sierra Wireless MAC Filtering Address Tip Sheet 09/16/2015
Sierra Wireless USB Serial Drivers Tip Sheet 09/16/2015
Dynamic DNS Tip Sheet 09/03/2015
IP Camera Router Tip Sheet 09/02/2015
AT&T Communication Manager Download
Sierra Watcher Download for Windows
Sierra Watcher Download for Mac
Using AT&T Momentum w/ a CradlePoint Or Peplink 06/30/2014

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