Fi, check your walls. With the right adapters, an existing wired connection can make boosting internet speed surprisingly easy.

If you're a Comcast Xfinity Internet customer, you may have gotten a nice surprise recently -- faster internet for no charge. And for some users, your new speed is double the speed you had previously.

Xfinity customers were given the gift of a free speed boost today, as Comcast confirmed that speed boosts were implemented for millions of Xfinity Internet customers on the morning of March 6. This is ...