Unstructured Supplementary Service Data (USSD) codes are strings of characters primarily used by developers and technicians to troubleshoot smartphones. You can use these codes to learn more about ...

QR or Quick Response codes are one of the most popular ways to access information on the go. Invented in 1994 and once considered the wave of the future, part of the QR code revival that started in ...

The native camera app on iPhone includes functionality that allows you to scan QR codes and access QR code content like URLs without having to download a third-party app. QR codes can include contact ...