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This map is clickable; click on any region shown to visit the page for those area codes.Area code 661 is shown in red. Area code 661 is a telephone area code in the North American Numbering Plan for the southern part of the San Joaquin Valley and for the far northern part of the Los Angeles metropolitan area .
The terminating carrier performs a database lookup using the caller's phone number to obtain the name information to display with Caller ID. If the data is with another carrier, then the terminating carrier must perform a lookup and pay a small "dip fee" to the carrier hosting the information. [3]
Some forms of city directories provide this form of lookup for listed services by phone number, along with address cross-referencing. Publicly accessible reverse telephone directories may be provided as part of the standard directory services from the telecommunications carrier in some countries.
Spy Dialer is a free reverse phone lookup service that accesses public databases of registered phone numbers to help users find information on cell phone and landline numbers and emails.
Check the sender: Look at the full email address or phone number, not just the display name. Analyze the content: Be wary of messages with urgent subjects, grammatical errors, or strange URLs.
Texting "HELP" to a short code causes the short code service to return a message with terms and conditions, support information — consisting of either a toll-free phone number or email address at a minimum — and other information from the leaseholder of the short code.
NumberGuru works by entering the telephone number that the user wishes to find information on. The owner's name, phone carrier, location, and type of phone are returned in the results. [6] It also allows user to enter information about business or marketer numbers such as spam reports. [7]
A number offering a directory inquiries service allowing people to request to be put through to a mobile phone number was established in June 2009. [14] 118 800 proved to be controversial, however, when it was revealed that it was making available 15 million mobile numbers that it had bought from market researchers. [15]