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On recent phone models running Android software, the phone will display a message saying "SIM network unlock PIN" or "Enter Network Lock Control Key" if network locked. Windows phones will display the message, "This SIM card can only be used on specific networks. Contact your customer service center for the unlock code".
Bootloader unlocking is the process of disabling the bootloader security that makes secure boot possible. It can make advanced customizations possible, such as installing custom firmware. On smartphones, this can be a custom Android distribution or another mobile operating system. Some bootloaders are not locked at all and some are locked, but ...
As a result of the lack of open access to the Subsidy Password database, a number of online services have grown around providing alternative unlocking software. The methods used to unlock cell phones vary although most involve reading the code from the phone and resetting it.
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.
Additionally, certain Samsung devices lack the ability to flash custom software, namely Samsung phones and tablets released in North America after 2015, with an exception for devices lacking a cellular modem, [68] although there are exploits that can unlock the bootloader on some affected devices running older One UI versions.
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.