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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.
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 ...
The MTPAS access class may be indicated on the SIM card, or in protected storage on the handset itself, by a set of numbers in the range 0 - 15, giving a total of 16 flag bits in the Access Control Class Elementary File (EFACC) in a USIM. For instance, if the 16-bit control word is 1010-0000-0011-1111, only phones with the MTPAS access levels ...
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]
A typical SIM card (mini-SIM with micro-SIM cutout) A SIM card or SIM (Subscriber Identity Module) is an integrated circuit (IC) intended to securely store an international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephone devices (such as mobile phones and laptops).
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.
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. Although UK VOIP phone providers are required to offer 999 / 112 service, this is subject to a registration for the service and with a verified service address and users need to be aware such ...
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.