Make no mistake, that surge has been massive. Says AT&T (T): “Since 2008 AT&T’s network in the San Francisco area has experienced a 3G data traffic increase of 2,000 percent.”

Wow. No wonder my calls kept dropping at that last Apple (AAPL) event in San Francisco (yes, an iPhone 3G repeatedly dropping calls at Apple’s Sept. invitation-only music gathering). In any event, the upgrade, which includes the bolstering of backbone infrastructure, should result in better coverage, 3G performance and in-building penetration.

“More than ever before, customers look to wireless communications to stay in touch with family, friends and business colleagues,” said Terry Stenzel, AT&T vice president and general manager for Northern California/Reno. “The additional spectrum helps to enhance the 3G network so that our customers have the best experience when they make a call, check an e-mail, download a video or song, access applications or surf the Internet on their AT&T device.”

The alliance will see the four cable and tech companies investing $3.2 billion in the nationwide wireless network that Sprint and Clearwire have been struggling–with profound unsuccess–to roll out. Comcast (CMCSA) will contribute $1.05 billion, Time Warner Cable (TWX) $500 million. Intel (INTC) will invest $1 billion, Google (GOOG) about $500 million. The new venture will be majority owned by Sprint, but it will take the Clearwire name and be run largely by Clearwire execs, among them cellular industry pioneer Craig McCaw.

For the cablecos, which have yet to settle on a clear wireless strategy, the deal is a quick and dirty way to establish the high-speed wireless network they need to compete with telcos like AT&T (T) and Verizon (VZ). For Sprint and Clearwire, it’s a chance to make their non-starter of a WiMax network viable and something happy to talk about when conversation turns to Sprint’s stock price, which has fallen nearly 60% over the past 12 months.

That said, the deal is not without its problems–top among them WiMax itself. As Craig Moffett, an analyst with Bernstein Research, explained in a note to clients earlier this year, the 2.5 GHz spectrum upon which Sprint and Clearwire are building their network isn’t nearly as good as the spectrum Verizon and AT&T just purchased in the FCC’s 700 MHz auction. “Serious questions remain about penetration through walls and windows,” Moffett explained. “Elsewhere in the world, operators have also raised questions about WiMax’s real-world bandwidth, latency and non-line-of-site coverage. How competitive the offering would be versus Verizon’s or AT&T’s planned LTE broadband service therefore remains to be seen.”

That it does–though there have been some indications that it may not be quite up to par. Speaking at an international WiMax conference in Bangkok in March, Garth Freeman, CEO of Buzz Broadband, Australia’s first WiMax operator, described the technology variously as a “disaster,” “miserable failure,” and a standard “mired in opportunistic hype.”

So will that prove true for Clearwire as well? We won’t know for some time. Building out a massive network like this will take some doing. “We’ll likely to see early trials in 2010, but a full-fledged build-out will take longer,” Clearwire CEO Benjamin Wolff said during a conference call this morning. “Building faster is a matter of logistics. The build plan we’ve laid out will be one of the largest and fastest build-outs ever done. We have the capability to do it, but it’s a massive undertaking.”

According to the World Economic Forum, Denmark, Sweden and Switzerland are the three most networked nations in the world. In its annual Global Information Technology Report, the Forum ranked 127 countries according to network readiness and found that Denmark, followed by Sweden and Switzerland, had not just the highest average broadband-Internet speeds, but the highest broadband penetration rates as well.

The countries also received high marks for their tech-friendly regulatory environments, something the United States apparently lacks. The US ranked fourth in the survey–up three places from last year–because of its (surprise!) poor scores for “Burden of Government Regulation,” “Effectiveness of Law-Making Bodies,” and “Total Tax Rate.”