# Short code

A short code is a 5- or 6-digit sender number used by businesses to send high-volume SMS such as verification codes; many virtual numbers cannot receive from short codes.

## What is Short code?

A short code is a 5- or 6-digit sender number used by businesses to send high-volume SMS such as verification codes; many virtual numbers cannot receive from short codes.

## Why it matters for verification

US and Canadian apps often send OTPs from short codes. Virtual ranges that cannot receive short-code traffic never get the message. Physical-SIM pools receive them normally.

Source: https://smsnitro.com/glossary/short-code