I knew it! We're getting f*cked on SMS (Text messaging)

Digital Domain - What Carriers Aren’t Eager to Tell You About Texting - NYTimes.com
...text messages are not just tiny; they are also free riders, tucked into what’s called a control channel, space reserved for operation of the wireless network.

That’s why a message is so limited in length: it must not exceed the length of the message used for internal communication between tower and handset to set up a call. The channel uses space whether or not a text message is inserted.

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