The mobile industry is now completing a huge shift in its attitude toward mobile data. Until pretty recently, the prevailing attitude among mobile operators was that data was a disappointment. It had been hyped for a decade, and although there were some successes, it had never lived up to the huge growth expectations that were set at the start of the decade. Most operators viewed it as a nice incremental add-on rather than the driver of their businesses.

But in the last year or so, the attitude has shifted dramatically from "no one is using mobile data" to "oh my God, there’s so much demand for mobile data that it’ll destroy the network." A lot of this attitude shift was caused by the iPhone, which has indeed overloaded some mobile networks. But there’s also a general uptick in data usage from various sources, and the rate of growth seems to be accelerating.

Extrapolating the trend, most telecom analyst firms are now producing mobile data traffic forecasts that look something like this:

The forecasts are driven by a couple of simple observations:

–Smartphones produce much more data traffic than traditional mobile phones. Cisco estimates that a single smartphone produces as much data traffic as 40 traditional feature phones. So converting 10 million people from feature phones to smartphones is like adding 390 million new feature phone users, in terms of impact on the data network. The more popular smartphones get, the busier the network becomes.

–A notebook PC generates far more traffic than a smartphone. According to Cicso, a single notebook computer generates the same data traffic as 450 feature phones. As notebook users convert to 3G-enabled netbooks and add 3G dongles to their computers, they dramatically increase the data traffic load on the network.

You can read Cisco’s analysis here.

This becomes especially interesting when you look at the forecasts for growth of 3G-equipped netbooks and notebooks. Mobile operators in many countries have started subsidizing sales of those devices if you pay for a data service plan. It’s an attractive deal for many people. Say your son or daughter is going off to college. Do you buy them a regular notebook computer and also pay for the DSL service to their apartment, or do you buy them a 3G data plan for about the same price as DSL and get the netbook for free?

The forecasting firm In-Stat recently predicted that by 2013, 30% of all notebook computers will be sold through mobile operators and bundled with 3G data plans (link). Notebook computer sales worldwide are about 150 million units a year, so that’s 45 million new 3G notebooks a year — or the data equivalent of adding 20 billion more feature phones to the network every year.

Jeepers.

These forecasts are producing a behind-the-scenes panic among mobile network operators. The consensus is that there’s no way their networks can grow quickly enough to support all that data traffic. There are several reasons:

–They can’t afford to build that much infrastructure.

–Even if they could afford the buildout, they won’t have enough bandwidth available to carry all that data, even with 4G.

–Traffic-shaping techniques like tiered pricing and usage caps can’t restrain usage growth enough to save them, because

–Fear of losing customers to a competitor will force them to continue to subsidize sales of 3G dongles and offer relatively generous caps in their data plans.

There are a number of projections that show the operators losing money on wireless data a few years from now, as costs continue to increase faster than revenue. The danger isn’t so much that they will all go broke, but they’re very afraid that they’ll turn into zero-profit utilities.

And WiFi Comes From Up on High

Many operators now seem to be counting on WiFi as their ultimate savior. The theory is that if they can offload enough of the data traffic from their networks to WiFi base stations connected to wired networks, then maybe other measures like 4G, usage caps, and aggressive improvements to the network will let them squeak through.

It’s an ironic situation. For a long time the mobile operators thought of themselves as the future lords of data communication. All devices would have 3G connections, the thinking went, and the fixed-line data carriers such as Comcast and BT would fade away just like the fixed-line voice companies are doing.

Instead, the new consensus is that we’re moving to a world where the fixed-line vendors will be expected to carry most consumer data traffic for the foreseeable future. They’ll provide your wireless connectivity at home and work, while the mobile network will fill in the gaps when you’re on the move. The area of disagreement, of course, is who will get the majority of the access revenue. We’ll let the fixed-line and mobile operators argue over that one; I want to talk about some of the other impacts of this weird new hybrid wireless world that we’re heading into.

(I touched on some of this in my post on net neutrality a couple of weeks ago (link), but I want to go into more detail here.)

[Editor’s Note: Cross-posted at MobileOpportunity. –mrh]