Where a call code beats a printed number
Reading a number off a sign and typing it in is where mistakes happen, especially on a moving van or across a street. A scan-to-call code goes straight to the dialler with the right digits. The phone never calls on its own; the person still presses the call button.
- Trade vans and shop windows, readable from a distance when printed large.
- “If found, please call” tags on luggage, keys and equipment.
- Property signs, so passers-by can call the agent.
Size for the distance
A rough rule: the code should be about one tenth of the scanning distance. That means 3 cm for a tag held in the hand, 10 cm for a poster read from a metre away, and 30 cm or more on a van read from across a car park. Larger is always safer than smaller.
Questions
Should I print the number too?
Yes. Some people won’t scan codes, and a printed number is also a fallback if the label gets scratched.
Can I include an extension?
Some phones accept a comma to pause before dialling an extension, such as +15551234567,204, but support varies. Test with the phones your callers are likely to use.
I want to save my full contact details instead.
Use a vCard QR code; it adds name, number and email to the contacts app.