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A CircuitMess Ringo phone, running a video game. It is possible to home-build a phone from partially open hardware and software. [83] [84] The Arduinophone [84] (touchscreen) and the MIT DIY Cellphone (segmented display) [85] [86] both use the Arduino open-hardware single-board computer, with added components.
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]
SIM unlocking allows a phone that is locked to a certain carrier to be used on a different carrier. The instructions vary per device and carrier, but this might be done by first requesting the carrier to unlock the phone or purchasing an unlock code online. [33]
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.
The most common purpose of the Turbo SIM is to spoof the IMSI number and authentication key (Ki) supplied by the SIM card to the network, allowing phones locked to use only a particular network such as the Apple iPhone, [4] [5] [6] and more recently NTT DoCoMo and SoftBank phones, to be used on any mobile network with which they are technically ...
This renders the phone useless on that network and sometimes other networks, even if the thief changes the phone's SIM card. Devices without a SIM card slot or eSIM capability usually do not have an IMEI, except for certain early Sprint LTE devices such as the Samsung Galaxy Nexus and S III which emulated a SIM-free CDMA activation experience ...
This is a list of Android distributions, Android-based operating systems (OS) commonly referred to as Custom ROMs or Android ROMs, forked from the Android Open Source Project (AOSP) without Google Play Services included officially in some or all markets, yet maintained independent coverage in notable Android-related sources.
SIM Application Toolkit (STK) is a standard of the GSM system which enables the subscriber identity module (SIM card) to initiate actions which can be used for various value-added services. [1] Similar standards exist for other network and card systems, with the USIM Application Toolkit (USAT) for USIMs used by newer-generation networks being ...