tel1234567890
tel1234567890 is a string that resembles a telephone number or a tel URI fragment. It is not a registered or routable number in any telecommunication network.
In documentation and software development, such arbitrary strings are used as placeholders for testing interfaces, forms,
If treated as a tel URI, the RFC 3966 standard defines tel URIs as tel:+1234567890. In practice,
Because tel1234567890 is not tied to a real number, it avoids exposing private information and can be
See also: E.164 numbering plan; RFC 3966; telephone numbering in software.