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Toll-free telephone numbers in the North American Numbering Plan have the area code prefix 800, 833, 844, 855, 866, 877, and 888. Additionally, area codes 822, 880 through 887, and 889 are reserved for toll-free use in the future. 811 is excluded because it is a special dialing code in the group NXX for various other purposes.
In Georgia, the prefix for toll-free numbers is 0800 followed with six digits. Toll-free calls are available both from mobile and landline phone operators. In Greece, the toll-free prefix is "800" followed by a seven-digit number or "807" followed by a four-digit number, used for phone card services only.
Google Voice is a telephone service that provides a U.S. phone number to Google Account customers in the U.S. and Google Workspace (G Suite by October 2020) customers in Canada, Denmark, France, the Netherlands, Portugal, Spain, Sweden, Switzerland, the United Kingdom and the contiguous United States.
By using a free reverse phone search service, you can enter the phone number that’s been calling you into a search engine and find out who owns that number.
Automatic number identification (ANI) is a feature of a telecommunications network for automatically determining the origination telephone number on toll calls for billing purposes.
Caller ID spoofing is a spoofing attack which causes the telephone network's Caller ID to indicate to the receiver of a call that the originator of the call is a station other than the true originating station. This can lead to a display showing a phone number different from that of the telephone from which the call was placed.
A VoIP phone or IP phone uses voice over IP technologies for placing and transmitting telephone calls over an IP network, such as the Internet. This is in contrast to a standard phone which uses the traditional public switched telephone network (PSTN).
Telephone numbers of the form 0600-xxx-xxxx and 0609-xxx-xxxx are premium rate numbers. The 0609 series is for entertainment (fixed rate), while 0600 is for services (the rate depends on the particular number).
Caller identification (Caller ID) is a telephone service, available in analog and digital telephone systems, including voice over IP (VoIP), that transmits a caller's telephone number to the called party's telephone equipment when the call is being set up.
A virtual number, also known as direct inward dialing ( DID) or access numbers, is a telephone number without a directly associated telephone line. Usually, these numbers are programmed to forward incoming calls to one of the pre-set telephone numbers, chosen by the client: fixed, mobile or VoIP.