It’s no secret that cellular providers price-gouge and under-deliver, but apparently they’re not well informed on what devices are worse for their networks. Ars Technica reports that smartphones use up to eight times more cellular capacity as laptops, based on a recent study by mobile internet provider Airvana.

“While a smartphone user downloads a fraction (typically 1/25th) of the data consumed by a laptop user, the signaling load produced by the smartphone user is much higher and in fact one third of the laptop user on average,” wrote Airvana. “In other words, while it takes 25 smart phones to equal the data throughput from one laptop, it only takes three smart phones to equal the signaling network impact of one laptop (25/3 ≈ 8x).”

The basic idea is that a cellphone does a lot of polling, making various checks and requests as long as the device is on, and most people leave their phone on pretty much all day.

Providers of cellular internet service traditionally have charged steep rates in order to have service for your laptop, and then cap your transfer at an almost unusable level. For instance, the $60/month “DataConnect” plan from AT&T “includes 5 GB of data,” meaning you will pay rather pricey overage rates if you download more than 5GB of data in a month. Unless all you do is check your email, and maybe do some light web surfing, you’re going to blow through that limit pretty quick. (And if you don’t do much more than that, it’s pretty hard to justify paying $60/month for mobile internet service for your laptop.) You’d better make sure your operating system or applications don’t run any software updates, otherwise you’re probably screwed.

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