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Simply place your Sim Card (Cingular or T-Mobile) in the Air Card slot and insert the unit into your USB port.

The Sierra Wireless Air Card 875 is a high quality Internet Card that easily adds a mobile broadband Internet connection to your Mac or PC laptop through your usb port. This air card has plenty of features, but most importantly delivers high speed Internet connections, expect speeds to 3.6 Mbps with this air card depending upon your provider and physical location. The air card is light weight and fits easily into your usb port in your laptop.

The Sierra Wireless Aircard is great for road warriors or people that take their laptops or mobile devices everywhere they go. You no longer have to spend a few bucks an hour to access your email and if you enjoy surfing the net when at your favorite coffee shop, you don't have to subscribe to their Internet plan. Expect speeds to 3.6 Mbps with this air card.

Installation is very simple, just install the software onto your computer and insert the card into your usb slot anytime you need an Internet connection.
If you travel overseas, you should know that this card has worldwide roaming so if you find a service that offers wireless Internet in Europe or Asia, you can easily use this card.

This most likely will not work on tmobile 3g, as it uses a different set of frequencies than everyone else. It would get edge on tmobile only. Would most likely work great for international travel.

Here are the specs.

Condition: New
Manufacture: Sierra Wireless
Product Line: Air Card
Part Number: 1100629 / 875U
Each unit is Unlocked and Tested with both Cingular and T-Mobile SIM Cards to ensure compatibility with Quad Bands
Includes: AirCard 875U USB Mode, AirCard 875U Product CD (Including Watcher User Software), Rechargeable Battery, Docking Cradle 1 Year Warranty
Supported OS: Windows Vista, XP, 2000, Vista, and Mac OS X and up
Field firmware upgradeable
High performance internal antenna
Transfer wireless data at speeds up to 3.6 Mbps on HSDPA capable networks
Supports worldwide roaming through HSDPA and UMTS on the 2100, 1900 and 850 Mhz band, Quad-band Class 12 EDGE /GPRS on the 850, 900, 1800 and 1900 MHz bands
Dimensions (WxDxH) 3.7 in x 1.5 in x 0.8 in
Weight 2.1 oz
Max Transfer Rate 3.6 Mbps
Cellular Enhancement Protocol GPRS, UMTS, EDGE, HSDPA

Just a word of warning if you buy one of these Sierra modems: That USB connector that adjusts for "convenient positioning" is VERY fragile and breaks easily. You'll then need to ship the modem to Sierra in Canada to be repaired for around $40.00.

I had one that NEVER had been connected directly to a USB port (went through a docking cradle) and one day it stopped working. Sent it in for warranty repair and got a bill instead.

would any one know if this would be faster than "internet sharing" through a T-Mobile WING connected through a miniusb/usb cable?

OR

Does this require a separate isp sim card?