The Limits of Unlimited Data
Why Verizon's unlimited iPhone plan won't last.
When Verizon launched its version of the iPhone last week, the carrier offered one major advantage over AT&T—an unlimited data plan. Although Verizon hasn't yet disclosed the price of its iPhone plan, it generally charges customers $29.99 a month to use the Internet all they want. AT&T, meanwhile, did away with its unlimited plan last year. The carrier now offers two iPhone plans whose prices depend on how much data you consume —you can download 200 MB of stuff for $15 a month, and 2 GB for $25. (AT&T will let you keep the old $30 unlimited plan if you signed up for it before the rate change last summer.)
AT&T's decision now looks ahead of its time. The Washington Post reported late last year that every major carrier—including Verizon—is considering ditching flat-rate data plans on next-generation "4G" networks, which will allow for much faster download speeds. Over the next few years those networks will become the main way our smartphones connect to the Internet. So don't get too attached to all-you-can-consume, flat-rate mobile browsing, Verizon iPhone users. It won't be around for long.
And say hooray, too, because unlimited data plans deserve to die. Letting everyone use the Internet as often as they like for no extra charge is unfair to all but the data-hoggiest among us—and it's not even that great for those people, either. Why is it unfair? For one thing, unlimited plans are more expensive than pay-as-you-go plans for most people. That's because a carrier has to set the price of an unlimited plan high enough to make money from the few people who use the Internet like there's no tomorrow. But most of us aren't such heavy users. AT&T says that 65 percent of its smartphone customers consume less than 200 MB of broadband per month and 98 percent use less than 2 GB. This means that if AT&T offered only a $30 unlimited iPhone plan (as it once did, and as Verizon will soon do), the 65 percent of customers who can get by with a $15 plan—to say nothing of the 98 percent who'd be fine on the $25 plan—would be overpaying.
But it's not just that unlimited plans raise prices. They also ruin service. Imagine what would happen to your town's power grid if everyone paid a flat rate for electricity: You and your neighbors would set your thermostats really high in the winter and low in the summer, you'd keep your pool heated year-round, you'd switch to plug-in electric cars, and you'd never consider replacing your ancient, energy-hogging appliances. As a result, you'd suffer frequent brownouts, you'd curse your power company, and you'd all wish for a better way. Economists call this a tragedy of the commons, and it can happen on data networks just as easily as the power grid—faced with no marginal cost, it's in everyone's interest to use as much of the service as they can. When that happens, the network goes down for everyone.
Who do we blame when that happens? The carrier, of course. But even though all cell companies are furiously improving their infrastructure, they're bound to keep suffering outages if they maintain flat-rate plans. For the same reason that building more highways doesn't reduce traffic—it just persuades more people to drive, blocking all those new lanes—building better networks won't improve service if the scourge of the unlimited plan remains. Customers would surely respond to better networks by using their phones more often, and that would clog the networks once more.
Farhad Manjoo is Slate's technology columnist and the author of True Enough: Learning To Live in a Post-Fact Society. You can email him at firstname.lastname@example.org and follow him on Twitter.
Photograph of man text messaging by Stockbyte.