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

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

I have an activated SIM in my iPad, can it be used in this 313U USB modem?

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

AT&T Momentum CradlePoint Peplink Tip Sheet 06/30/2014

If you already purchased this item from 3Gstore, Log In to the support portal to access these downloads.
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