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B312E Cheatbook: pump up your Samsung Metro!

This is probably the most complete cheats and secret codes reference for the new Samsung SM-B312E phone you can ever find on the Internet. The main reason I say this is because most of the codes were dumped straight from the firmware (the European version, B312EXXNE6), others, meant for much older models, were also found on the Internet, but almost all of them were then tested on a real device (if the code is not tested, there's a note about this in the "Notes and warnings" column) and a description was made what do they do right here, on B312E. This cheatbook is divided into several parts: information codes, testing codes, setting codes, codes with undefined behavior and general tips and tricks.

Please note: GSM-related USSD codes (such as call divert, Caller ID display etc) are not included here because all of them are common for all GSM phones, their functionality is completely duplicated in standard call settin

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--force-dark-mode
--enable-features=WebUIDarkMode

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Landmark: the simplest Markdown engine for the browser

Landmark is a small but extensible JavaScript library that allows to render Markdown documents into HTML. It's the primary engine for Sitemark and some other projects.

Usage

Landmark features only 2 methods:

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DaBi: data binding library that keeps it simple

DaBi (short for Data Binding) is a dead simple yet complete and self-contained DOM-to-JS and JS-to-DOM data binding library in just 25 lines of pure ES5 and 454 bytes when minified.

How to obtain

Download it right here or include it into your HTML:

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// Input: a string of digits (w/o the check digit)
// Output: the check digit

// Universal algo - smallest option so far (67 chars after the assignment):
luhn=s=>(10-[...s].reverse().reduce((a,v,i)=>a+v*(i&1?1:2.2)|0,0)%10)%10

// IMEI version (14-digit or any other even-digit input) - smallest option so far (57 chars after the assignment):
luhnImei=s=>(10-[...s].reduce((a,v,i)=>a+v*(i&1?2.2:1)|0,0)%10)%10

// Credit card version (15-digit or any other odd-digit input) - smallest option so far (57 chars after the assignment):

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// Telememer: a JS library to encode/decode information to/from Casio module 2747/5574 Telememo 30 format
// Supports up to 378 bytes of raw binary data
// Requires BigInt support in the browser's or other JS engine
// Created by Luxferre in 2023, released into public domain
// Made in Ukraine

Telememer = (params => {
  var nameAlphabet = params[0],
      digitAlphabet = params[1],
      indexAlphabet = params[2],

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Micromark: probably the smallest JS framework to create your own text markup languages

Overview

Have you ever dreamed of creating your own simple text markup language without all the overhead of existing parsers? Now it is possible thanks to this tiny function. Define your own rules for substituting your own character tags with HTML markup and pass them to Micromark along with your text, and it will return ready HTML code.

How to use the engine

Call the function like this:

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            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
                    Version 2, December 2004

 Copyright (C) 2013 plugnburn

 Everyone is permitted to copy and distribute verbatim or modified
 copies of this license document, and changing it is allowed as long
 as the name is changed.

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE

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//USB I/O class for WebUSB
//(c) Luxferre 2020-present

class USBIO {

  //Possible devFilter fields: classCode, subclassCode, protocolCode, vendorId, productId, serialNumber (not recommended)

  constructor(devFilter = {}) {
    this.requestDeviceObject = {filters:(devFilter ? [devFilter] : [])}
    this.devFilter = devFilter

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            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
                    Version 2, December 2004

 Copyright (C) 2013 plugnburn

 Everyone is permitted to copy and distribute verbatim or modified
 copies of this license document, and changing it is allowed as long
 as the name is changed.

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE