Cap as Cap Can: Comcast, T-Mobile Redefine Data Limits in Ways You May Not Like
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The pleasant simplicity of unlimited data looks like an increasingly limited proposition in the broadband business.

Billing by the bit doesn’t have to be customer-hostile. But two recent moves — Comcast’s expansion of its Data Usage Plan and T-Mobile’s introduction of a new BingeOn video-streaming service — seem unlikely to improve its reputation.

(FYI, for those of you who are on metered bandwidth plans: Based on download sizes for last week’s column, this one will chew up about 4.2MB of data on a laptop, 3MB on a phone.)

Comcast’s don’t-call-it-a-cap cap

Comcast is no stranger to data caps. The nation’s largest Internet provider imposed a hard 250GB limit on customers until 2012. At that time, the company said it would test a 300GB “threshold”Comcast wishes you wouldn’t call it a “cap” — with additional 50GB allotments available for $10 each.

About 8 percent of Comcast subscribers exceed that 300GB mark, spokesman Charlie Douglas said Monday; overall, the top 10 percent of its customers account for 50 percent of the data on its network.

In 2013, Comcast added a Flexible Data Option, which cuts your monthly bill by a measly $5 if you accept a 5GB cap but then dings you $1 for each gig over. In September, it began testing an Unlimited Data Option for an additional $30 to $35 per month; last week it said it would expand this scheme to 11 more markets in the South.

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This regime of rules governing roughly 12 percent of Comcast customers, according to analyst Craig Moffett, remains deeply problematic.

First, Comcast’s tiers make it difficult, as Douglas phrased it, to “have light data users pay a little bit less.”

That’s because Flexible Data’s 5GB cap is less “light” than “punitive.” A single operating-system patch like Apple’s 1.19GB OS X 10.11.1 update will devour a large fraction of it. And, unlike AT&T or T-Mobile, Comcast offers no data rollover, so you can’t bank unused data one month for a hefty but essential bug fix the next.

Second, the multiple-device reality of home Internet use means you can’t easily track data usage per app as you can on a phone. My living room, for instance, features an HDTV, a Blu-ray player, and a Chromecast, each of them running streaming video apps. But Comcast’s Usage Meter can’t break down how those gadgets might individually binge on bandwidth — if you want to play by Comcast’s rules, Comcast doesn’t give enough help.

Third, Comcast’s usage-based pricing doesn’t scale for speed. If you pay more for a faster connection — the other way Comcast charges heavy data users extra — the 300GB tier stays fixed in every covered Comcast market except Tucson. There, paying for faster speed ups your data limit, but only to 600GB.