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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.
Unlocking the bootloader allows installing and running unsigned code on a device, including user customized software. Operating outside the manufacturer specification might usually result in voiding any warranties and may make the device susceptible to data theft, as the integrity of the operating system (as intended by the manufacturer) can no longer be guaranteed. [1]
A SIM lock, simlock, network lock, carrier lock or (master) subsidy lock is a technical restriction built into GSM and CDMA [1] mobile phones by mobile phone manufacturers for use by service providers to restrict the use of these phones to specific countries and/or networks.
Digital Phone Company Ltd. Not operational: GSM 1800: Owned by AIS; network shut down in October 2019 [108] [114] 520: 25: WE PCT: True Corporation: Not operational: PHS 1900: In Bangkok area 520: 47: dtac-T, True-T: National Telecom Public Company Limited: Operational: TD-LTE 2300: Former TOT Public Company Limited; LTE band 40; for dtac and ...
The phone identifies the subscriber by transmitting the International mobile subscriber identity (IMSI) number, which is stored on a SIM card that can, in theory, be transferred to any handset. However, the network's ability to know a subscriber's current, individual device enables many network and security features.
Optus Mobile customers reported that their phones showed 'SOS' on the signal indicator, which is a sign the regular network is down, but mobile phones still have access to alternate networks in the event of an emergency call by using a so-called camping mechanism; however, Optus landlines were unable to make emergency triple-zero calls.
The Cell Phone Freedom Act (formally An Act respecting the locking of cellular telephones) was a private member's bill proposed twice to the Parliament of Canada which would have required mobile phone providers remove the SIM lock from devices once a customer reaches the end of their contract.
Home Affairs and Cyber Security Minister Clare O'Neil said Optus was at fault for the attack, refuting Optus's argument the attack was complicated. O'Neil also stated the attack should not have happened, stating: "Responsibility for the security breach rests with Optus[,] and I want to note that the breach is of a nature that we should not expect to see in a large telecommunications provider ...
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