People could send a text message with the code and get a message back confirming that what they bought is listed in a database.

VOA: special.2010.03.01

If you have some plain text, some message that you want to send, well, you can encrypt it or you can scramble it using a key, a secret key, which might be a physical machine like the Enigma 13 or it might be a number like 13.

如果你有没有加密的文本，你想要寄送的一些消息,你就可以加密它,或者你可以用一个密钥使其变得混乱，那就像一个英格玛的物理装置,或者他就是一个数字。

哈佛公开课 - 计算机科学课程节选

When you buy a drug, you scratch the panel, you send a text message with the number that you see, and you get a response instantly at the counter if the drug is genuine or fake."

VOA: standard.2010.06.07

In addition to the small display, the board can be programmed to send text message or email alerts, and in the future could tie into venting or heating systems for completely automated control.

ENGADGET

Beyond merely guarding the entrances to your house, he shows how the software can keep a detailed log or send text message alerts every time any door in the house is opened, to monitor practically every activity in the house.

FORBES: ADT iPhone App Lets You Play Big Brother In Your Own Home

The claim is that the telecoms companies charge us more per unit of data to send a text message next door than it costs to send a message to Mars.

FORBES: Insane Calculation: It Costs More To Send A Text Next Door Than To Mars