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2. Caller ID - Wikipedia

   en.wikipedia.org/wiki/Caller_ID

   Caller-ID system response sounds in various cases: analog, ISDN and digital PBX 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.

3. List of mobile telephone prefixes by country - Wikipedia

   en.wikipedia.org/wiki/List_of_mobile_telephone...

   TIM there are many legacy 9-digit numbers 361: 13 (3 10) TIM operator reserved (TACS legacy routing number) 362: 13 (3 10) TIM operator reserved (GSM/UMTS routing number) 363: 12 ("36" 10-digit MSISDN) TIM operator reserved (voice mail) 366: 10: TIM: 368: 9-10: TIM there are many legacy 9-digit numbers 370: 10

4. North American Numbering Plan - Wikipedia

   en.wikipedia.org/wiki/North_American_Numbering_Plan

   *82 and 1182 — releases Caller ID block on a call-by-call basis *87 — deactivates Anonymous Call Rejection Service; The four-digit numbers are not implemented in some areas. The star codes (*) are for use on Touch-Tone telephones, whereas the four-digit numbers prefixed 11xx are used on rotary dial telephones which cannot dial the * symbol.

5. List of country calling codes - Wikipedia

   en.wikipedia.org/wiki/List_of_country_calling_codes

   Zone 5 uses eight 2-digit codes (51–58) and two sets of 3-digit codes (50x, 59x) to serve South and Central America. Zone 6 uses seven 2-digit codes (60–66) and three sets of 3-digit codes (67x–69x) to serve Southeast Asia and Oceania. Zone 7 uses an integrated numbering plan; two digits (7x) determine the area served: Russia or Kazakhstan.

6. Vertical service code - Wikipedia

   en.wikipedia.org/wiki/Vertical_service_code

   Speed calling (8 numbers) *75 1175 Speed calling (30 numbers) *77 1177 Anonymous call rejection activation *78 1178 Do not disturb *79 1179 Do not disturb disable *80 1180 Call blocking disable *81 1181 Priority call disable *82 1182 Caller ID (per call) *31#/1832 [11] 1470 *83 1183 Selective call forwarding disable *85 1185 Caller ID disable ...

7. Telephone number - Wikipedia

   en.wikipedia.org/wiki/Telephone_number

   For example, a telephone number in North America consists of a three-digit area code, a three-digit central office code, and four digits for the line number. If the numbering plan area does not use an overlay plan with multiple area codes, or if the provider allows it for other technical reasons, seven-digit dialing may be permissible for calls ...

8. Emergency telephone number - Wikipedia

   en.wikipedia.org/wiki/Emergency_telephone_number

   The actual number is not even transmitted into the network, but the network redirects the emergency call to the local emergency desk. Most GSM mobile phones can dial emergency numbers even when the phone keyboard is locked, the phone is without a SIM card, emergency number is entered instead of the PIN or there is not a network signal (busy ...

9. Caller ID spoofing - Wikipedia

   en.wikipedia.org/wiki/Caller_ID_spoofing

   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. [1]