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  2. Fixed Dialing Number - Wikipedia

    en.wikipedia.org/wiki/Fixed_dialing_number

    Fixed Dialing Number (FDN) is a service mode of a GSM mobile phone's SIM card. [1] Numbers are added to the FDN list, and when activated, FDN restricts outgoing calls to only those numbers listed, or to numbers with certain prefixes. [1] A notable exception is that emergency calls to 000, 112, 911, 999 and the like are exempt. [2]

  3. Emergency telephone number - Wikipedia

    en.wikipedia.org/wiki/Emergency_telephone_number

    The mobile phone and the SIM card have a preprogrammed list of emergency numbers. When the user tries to set up a call using an emergency number known by a GSM or 3G phone, the special emergency call setup takes place. The actual number is not even transmitted into the network, but the network redirects the emergency call to the local emergency ...

  4. Closed user group - Wikipedia

    en.wikipedia.org/wiki/Closed_User_Group

    be allowed to make emergency calls irrespective of the group subscription. be allowed to make call inside the closed user group member like incoming and outgoing also. If the user is a member of multiple closed user groups there will be a preferred CUG assigned by the network that will be used by default.

  5. ACCOLC - Wikipedia

    en.wikipedia.org/wiki/ACCOLC

    Reliable access to the mobile networks, even during times when an exceptionally large number of calls are being made, is achieved by installing a special SIM (subscriber identity module) card in the telephone handset. Special SIMs are only available to entitled users within the emergency services community, and not to members of the public.

  6. List of emergency telephone numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_emergency...

    Mobile phones only. From landline phones dial the local police station, hospital or fire brigade. Guernsey: 112 or 999 Hungary: 112 or 107: 112 or 104: 112 or 105: Water emergency – 1817. [83] Iceland: 112: Non-emergency police Reykjavík area – 444 10 00; 911 redirects to 112 on mobile phones; +354 570 2112 from abroad. Ireland: 112 or 999

  7. Telephone numbers in the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_the...

    Although some mobile phones allow emergency calls to be attempted without a SIM card, at present the UK networks reject such calls. Since November 2009, an emergency call can be made through any UK mobile network as long as there is a SIM for any valid UK network in the handset.

  8. Voice over LTE - Wikipedia

    en.wikipedia.org/wiki/Voice_over_LTE

    VoLTE calling. Voice over Long-Term Evolution (acronym VoLTE) is an LTE high-speed wireless communication standard for voice calls and SMS using mobile phones and data terminals. [1] [2] VoLTE has up to three times more voice [3] and data capacity than older 3G UMTS and up to six times more than 2G GSM.

  9. 000 (emergency telephone number) - Wikipedia

    en.wikipedia.org/wiki/000_(emergency_telephone...

    [7] 000 is the only emergency number that can be dialled from fixed lines including public payphones. No SIM card is required to call to 000. For non-life-threatening situations and natural disasters, the State Emergency Service (SES) number 132 500 should be called instead. [1] For non-emergency calls to the police in Australia, 131 444 should ...