The <b>T-Mobile Rocket 3.0 4G Laptop Stick</b> USB modem provides a fast Internet connection for a single computer and gives unlimited access to T-Mobile Wi-Fi hot spots. The device has a nice design ...

If you’re looking to buy a new smartphone or computer you’ve probably seen advertisements and offers for 4G-compatible devices. You might even own a 4G-compatible device already. But just what is 4G?