---
product_id: 12547502
title: "AT&T Sierra Wireless USBconnect Shockwave U308 3G 4G USB Modem GSM Used - Black"
brand: "sierawireless"
price: "₨656"
currency: LKR
in_stock: false
reviews_count: 8
url: https://www.desertcart.lk/products/12547502-at-and-t-sierra-wireless-usbconnect-shockwave-u308-3g-4g
store_origin: LK
region: Sri Lanka
---

# 21.1 Mbps DL Global Roaming 5.76 Mbps UL AT&T Sierra Wireless USBconnect Shockwave U308 3G 4G USB Modem GSM Used - Black

**Brand:** sierawireless
**Price:** ₨656
**Availability:** ❌ Out of Stock

## Summary

> 🚀 Connect to the Future with Speed!

## Quick Answers

- **What is this?** AT&T Sierra Wireless USBconnect Shockwave U308 3G 4G USB Modem GSM Used - Black by sierawireless
- **How much does it cost?** ₨656 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.lk](https://www.desertcart.lk/products/12547502-at-and-t-sierra-wireless-usbconnect-shockwave-u308-3g-4g)

## Best For

- sierawireless enthusiasts

## Why This Product

- Trusted sierawireless brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Effortless Setup:** Enjoy hassle-free installation with Sierra Wireless AirCard automatic software installation.
- • **Expandable Storage:** Utilize the microSD slot for additional storage, making it easy to carry your essential files wherever you roam.
- • **Sleek & Durable Design:** Designed for the modern professional, this modem combines style with performance for a device that looks as good as it works.
- • **Seamless Global Connectivity:** Stay connected worldwide with robust global roaming capabilities, ensuring you’re always in touch.
- • **Unleash Lightning-Fast Speeds:** Experience blazing download speeds of up to 21.1 Mbps, perfect for streaming and downloading on the go.

## Overview

The AT&T Sierra Wireless USBconnect Shockwave U308 is a high-performance USB modem that offers lightning-fast wireless download speeds of up to 21.1 Mbps and uplink speeds of up to 5.76 Mbps. With global roaming capabilities and a microSD slot for expandable storage, this modem is designed for professionals who need reliable connectivity on the go. Its automatic software installation feature ensures a seamless user experience.

## Description

The AT&T USBConnect Velocity provides laptop connectivity on the nation's fastest 3G network with added storage portability and GPS functionality to keep you more productive while on the go. Enjoy usage in more than 20,000 AT&T Wi-Fi Hot Spots in the U.S. with a qualifying DataConnect rate plan and a Wi-Fi enabled laptop. And pack lighter by using the microSD slot to store, back up, and transfer files with up to 32 GB of additional storage (microSD card sold separately).

## Features

- Access to the fastest wireless download speeds available, with up to 21.1 Mbps downlink and up to 5.76 Mbps uplink
- New industrial design and performance improvements
- Global roaming capabilities
- microSD slot
- Sierra Wireless AirCard automatic software installation

## Images

![AT&T Sierra Wireless USBconnect Shockwave U308 3G 4G USB Modem GSM Used - Black - Image 1](https://m.media-amazon.com/images/W/MEDIAX_792452-T1/images/I/418KSgRRBBL.jpg)

## Questions & Answers

**Q: I have an 3g shockwave. Can I use my sim card from the old unit in this generation. I don't want a new card because I have unlimited data plan...**
A: I changed the moden several times.  All AT&T did was change the sim card for no charge.

**Q: is there an antenna port?**
A: There is no antenna port.  It is wireless modem that dials and connects for your internet service only if you have s service provider.

**Q: Can i use this USB for sending lot of SMS by one time?**
A: I am not sure, but I use mine every day and have had several websites up at the same time. And have not had any problems.

**Q: Does this work abroad?**
A: honestly, it barely worked in the US. Save your money go big or go to a store with experts.

## Customer Reviews

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Review on AT&T Sierra USBConnect 308 Shockwave 4G HSPA+ Modem
  

*by W***. on Reviewed in the United States on September 28, 2011*

I bought this modem after considering several others because it was compatible with my Cradlepoint mbr900 wireless/10baseT router. AT&T map coverage shows 4 cell towers within 1 mile of my house in each direction. I live in a low lying area, and don't always get best reception. I use my Cradlepoint MR900 router(since discontinued) hooked up to this modem in a upstairs bedroom window to get a decent signal(1 bar VS 3 bars), and is 10baseT networked to my office in the basement.  This is not a reflection on AT&T signal, but just my area and location gets very poor reception.With all of this being said my download maxs out at 4-mb a minute and up loads are about 1-mb a minute. This is excellent thru-put considering I was on dial-up (56kps) before. This modem is the latest generation 4G modem. It hasn't disappointed me yet. Hope to get a net book soon and take it out on the road. I'll give you another update then.As far as other reader/reviewers asking about the sim card I didn't have a att cell phone prior to getting this plan. However broadband sim card doesn't look any different in size or shape then what is in my current phone. That being said my local att represenitive had to key in both the s/n of the 308 shockwave and and the s/n of the sim card in order to activate my account. Don't know if it can be interchanged based on your cell plans. I bought the USB modem outright and went under as pay as you go plan.Followup (December 2011)I sine bought a used net-book to have on the road to receive internet & emails with my broadband card. I have traveled up & down the Balto/Wash I-95 route and into Virginia and down as far as tennesee area, with no problem with getting a signal. My plan is with ATT 5gb limit with 10.00/1gb overage coverage.Followup (December2012) I have since moved up to ATT Momentum USB modem. Its about 40% faster during page viewing. and about 20% faster on downloads. Haven't been out on the road yet.

### ⭐⭐⭐ 3.0 out of 5 stars







  
  
    Three Stars
  

*by J***. on Reviewed in the United States on June 21, 2016*

Won't stay connected!!!

### ⭐ 1.0 out of 5 stars







  
  
    Defective
  

*by G***S on Reviewed in the United States on February 14, 2013*

When I received the device, I plugged it in, and the LEDs just flash once, then shut off.  I've gotten some drivers to install, and it shows up in my devices, but doesn't show up as a usb or allow me to install the network program.  I then downloaded the airwatcher program from sierra, and it won't recognize the device either.  After several hours troubleshooting, I gave up and am calling this defective.  Hopefully it works better for everyone else.

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**Shop now:** [https://www.desertcart.lk/products/12547502-at-and-t-sierra-wireless-usbconnect-shockwave-u308-3g-4g](https://www.desertcart.lk/products/12547502-at-and-t-sierra-wireless-usbconnect-shockwave-u308-3g-4g)

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*Product available on Desertcart Sri Lanka*
*Store origin: LK*
*Last updated: 2026-03-10*