A text message, already written.
Your number and the message you want them to send. They scan, they tap send, and you get a text that tells you where they were standing when they sent it.
More style options
Light grounds only — the code has to stay darker than what it sits on.
Six looks, made for small things in public.
Pick one and it fills in the generator above. Equipment label and Parking bay are drawn for surfaces that get weathered and touched.
Where these earn their keep
Table and room service
Somebody wants another drink and cannot catch an eye. The text says which table, so nobody has to go and find out.
Car parks and bays
Pay, extend, or report the machine that ate the coin. The bay number is in the message before they have started typing.
Maintenance and faults
A sticker on the lift, the gate or the pump, each with its own keyword. The report identifies the thing it came from.
Questions people ask
Does it send the message automatically?
No. The messaging app opens with the number and the text filled in, and the person taps send. A code that sent a message on its own would be a code nobody should ever scan.
Will the prefilled text work on an iPhone?
The number always does, and the message does on current versions. Some older builds of iOS drop the text and open the conversation on the right number, so the code still does something useful — worth knowing if your keyword is doing real work, and worth printing the word next to the code if it is.
Can people reply to it?
It is an ordinary text to an ordinary number, so yes — whatever number you put in receives it and can answer. There is no service in the middle.