How to make an SMS QR code
An SMS QR code opens the phone's messaging app with your number in the To box and, if you want, a message already written. The person checks it and presses send. It uses a normal text message, so it works without internet and without any chat app.
- Pick the country and type the phone number
- Type an optional message, for example JOIN or the word your system expects
- Check the line under the number box that shows how it will be dialled
- Download the code and test it
Text message QR codes for keywords and feedback
SMS codes suit cases where the message itself matters. A shop can ask customers to text a keyword to enter a lucky draw. A clinic can let patients text CONFIRM to a booking number. A school can let parents text their child's roll number to an office line. The pre-typed message removes spelling mistakes that confuse an automatic system.
They also help people who do not use WhatsApp or have no data balance at the moment. A plain SMS still goes through.
Where to put an SMS QR code
Good spots are counter stands, product boxes, bills, posters at bus stops, and the back of a feedback card. The default label reads Text us, and the Auto logo shows a speech bubble. If the message triggers something, say so on the label, such as Text to join.
Sizing and testing tips
The code holds a short phone number and message, so it stays clean even at 2 cm wide. A long message makes the pattern denser, so keep the text brief. Note that the person's normal SMS charges apply, which is worth mentioning on promotional posters.
Before printing, scan the code with your own phone and look at both the number and the message in the new text. Send it once to make sure the reply arrives where you expect, especially if an automatic system answers. Print the number and the keyword in plain words next to the code as well. Older phones without a camera scanner can still send the text by hand, and people trust a code more when they can see what it will do.
If you run several campaigns, use a different keyword in each code. The keyword in each incoming SMS then shows which poster or product the person scanned.
SMS QR code not working?
- Some phones fill the number but leave the message empty; ask the person to type it if missing
- Check the country code if the number shows wrong
- A short code number may not fit the phone number check, so test it with a scan before printing
- If the camera shows only text, the scanning app may not support SMS codes; the built-in camera on recent phones usually does
Remember that the reply comes from the number in the code, so keep that SIM active. If the line is closed later, every printed code stops being useful.