Mark SullivanSenior Editor, PCWorld

Mark has been writing about networks - social and wireless - since 2005. Independent and outgoing, he enjoys travelling, wine, and skiing. His favorite book is "Atlas Shrugged" by Ayn Rand.

U.S. Wireless Carriers Take Different Routes Toward Fast 4G Service

The Big Four wireless providers updated and expanded their 4th Generation wireless network plans. Each is taking a very different direction.

CTIA 2010: Wireless Show Highlights in Pictures

The CTIA wireless trade show is abuzz this week with hot new cell phones, accessories, and services.

T-Mobile's New York City Network is Proof of HSPA+ Speed

T-Mobile upgraded its New York City network by the time PCWorld performance tested it in January--and it showed.

My 4G Drive-around with Sprint in Las Vegas

Does Sprint’s WiMAX service deliver the speeds promised by 4G? For the most part, yes.

Sprint 4G Service Coming to LA, Miami, Others

With new WiMAX markets announced, the carrier increases its lead over AT&T, Verizon and T-Mobile in the race to 4G


SXSW Festival: Top Five New Apps from Austin

The best apps I saw here are social, location-aware, useful and entertaining. And pretty geeky.

SXSW: Spotify Keeps U.S. in Suspense

The buzz-worthy European music service will eventually launch on these shores, but not today, and only after making peace with US labels.


SXSW: Twitter Announcement a Real Yawner

There was a line to get out of the room during Evan Williams’ talk here in Austin.

SXSW Notes: QR Codes Are Everywhere

Those little black and while boxes are a physical bridge from the real world to the web world.

SXSW Apps:, Huddlehub and Phonebooth

I've been cruising the exhibit hall looking for cool apps (and free beer), and found a little of both.


SXSW Diary: Skepticism, Strong Feelings About Yelp

Perhaps the liveliest discussion I’ve seen here was about the popular social reviews site.

SXSW: Augmented Reality and the Outer Web

Augmented reality could produce the killer apps of tomorrow, but for now the concept is more talk than walk.

SXSW Notebook: Geolocation, Geolocation, Geolocation

The marriage of geotagging and mobile social networking apps is the hot topic of conversation here in Austin.


Comcast Fancast Xfinity TV Hasn't Lived Up to Expectations

The service promised to bring the cable TV experience to the PC and other small screens, but Comcast's content partners have not ponied up enough of the best movies and shows for online viewing.


AT&T Roars Back in PCWorld’s Second 3G Wireless Performance Test

After generating disappointing results in our tests last spring, AT&T’s 3G network is now the top performer in our 13-city tests, with download speeds 67 percent faster than its competitors'.