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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]
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.
Updating Android software is done over GSM where the SIM Toolkit may install automatically with new software regardless of automatic install applications. Change in applications and menus stored on the SIM is difficult after the customer takes delivery of the SIM and sometimes may be recognized as surveillance software.
However, the support may be limited only to certain phones – for example, LG released its bootloader unlock tool only for certain models of its phones. [47] Also, a manufacturer could discontinue bootloader unlocking support, as was the case with LG [ 48 ] and Huawei .
George Hotz developed the first iPhone unlock, which was a hardware-based solution. Later, in 2009, he released a jailbreaking tool for the iPhone 3G and iPhone 3GS on iPhone OS 3.0 called purplera1n, [49] and blackra1n for iPhone OS version 3.1.2 on the 3rd generation iPod Touch and other devices. [50]
In 2017, rumors started to circulate that Grayshift had created a device able to unlock iPhones, following the Apple–FBI encryption dispute where US law enforcement agencies unsuccessfully tried to compel Apple to write software that would enable the government bypass these devices' security and unlock the phones.
The unlock codes retrieved must be entered into the mobile phone using the keypad. For DCT4 and DCT3 Nokia, unlock codes consist of a "#" key, followed by "pw+", 10 (DCT3) or 15 (DCT4) digits, "+", and another number ranging from 1-7, and finally ends with a "#". Depending on the carrier which the phone is locked to, only some codes will work ...
An iPhone 5C (color), the model used by one of the perpetrators of the 2015 San Bernardino attack. The Apple–FBI encryption dispute concerns whether and to what extent courts in the United States can compel manufacturers to assist in unlocking cell phones whose data are cryptographically protected. [1]
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