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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.
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 "cocaine alert" sign posted by GGD Amsterdam: the sign reminds people to "Call 112 for an ambulance."112 was first standardised as the pan-European number for emergency services following the adoption of recommendation [1] by the European Conference of Postal and Telecommunications Administrations (CEPT) in 1976 and has since been enshrined a CEPT Decision ECC/DEC/(17)05.
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.
The U.S. believes Chinese intelligence hacked into AT&T, Verizon and Lumen Technologies and gained significant access, including records of phone calls and text messages for many people ...
To make matters worse, some phones make it easier to call the emergency services when the keypad is locked than it would be otherwise. An example of this is a soft key programmed to make an emergency call when the keylock is set. On touch-screen phones, passcode screens often include a single button that, when touched for just a few seconds ...
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