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After switching on the phone, if the PIN security function is active, the user is required to enter a 4-8 digit PIN to unlock the SIM card and connect to the mobile network. Without this, functions such as phone calls (except for emergency calls), text messages and mobile data will not be available.
Dialing a known emergency number like 112 forces the phone to try the call with any available network. On some networks, a GSM phone without a SIM card may be used to make emergency calls, and most GSM phones accept a larger list of emergency numbers without SIM card, such as 112, 911, 118, 119, 000, 110, 08, and 999. [27]
Some telephones have facilities to make calls through a calling card service whose access details and PIN are also stored in the telephone's memory. This may be implemented in different ways, often by pressing one button before making a call; some telephones support "chain dialing", allowing additional numbers to be dialed when on a call (e.g ...
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In some cases, a SIM-locked handset is sold at a substantially lower price than an unlocked one, because the service provider expects income through its service. SIM locks are employed on cheaper (pay-as-you-go) handsets, while discounts on more expensive handsets require a subscription that provides guaranteed income. Unlocked handsets have a ...
Even where the default PIN is not known, social engineering can be used to reset the voicemail PIN code to the default by impersonating the owner of the phone with a call to a call centre. [ 6 ] [ 7 ] During the mid-2000s, calls originating from the handset registered to a voicemail account would be put straight through to voicemail without the ...
During one of the calls, the caller said one word: “Help.” “During the frantic call, a fast-thinking technician sent a Prepared Live Link to the number,” the post said.
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]