Problems
Caller identification between countries is often not transmitted, instead with the display indicating "UNAVAILABLE" or "INTERNATIONAL", but it is becoming more widely available including the country calling code. This is usually the case with mobile phones and international roaming. However, the overseas number may be compressed into a "domestic" format and thus possibly not be recognizable: e.g. a US number 1 646 555 1212 may be displayed in the UK as 0646 555 1212, instead of 001 646 555 1212 (or as +1 646 555 1212, where the "+" represents the access code to dial international numbers).
Some callers have situations in which revealing the number being called from would invade their privacy or cause other severe problems. Calls from women's shelters often have outgoing caller ID blocked.
Caller ID may not give the caller's information if the caller is using a discount or travel calling program or a voice over IP phone, because those systems use intermediate telephone numbers in the country being called.
Some long distance telephone cards, especially those using VOIP to carry calls, mask caller ID information. These calls are commonly displayed as "Out of Area".
Read more about this topic: Caller ID
Famous quotes containing the word problems:
“I am always glad to think that my education was, for the most part, informal, and had not the slightest reference to a future business career. It left me free and untrammeled to approach my business problems without the limiting influence of specific training.”
—Alice Foote MacDougall (1867–1945)
“More than a decade after our fellow citizens began bedding down on the sidewalks, their problems continue to seem so intractable that we have begun to do psychologically what government has been incapable of doing programmatically. We bring the numbers down—not by solving the problem, but by deciding it’s their own damn fault.”
—Anna Quindlen (b. 1952)
““What we know, is a point to what we do not know.” Open any recent journal of science, and weigh the problems suggested concerning Light, Heat, Electricity, Magnetism, Physiology, Geology, and judge whether the interest of natural science is likely to be soon exhausted.”
—Ralph Waldo Emerson (1803–1882)