science

Subsidy Password

Subsidy Password is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Subsidy Password rather than just read about it. In short: The term, Subsidy Password, is used by Motorola and other handset manufacturers to refer to the 8-digit code (or 16-digit code for phones such as the Motorola K1) unlock code necessary to remove the operator lock (also known as subsidy lock) from cell phones. This code is randomly assigned to individual cell phones by the OEM on request of the mobile service operator and prevents the use of a particular phone on a c…

Key takeaways

Subsidy Password belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Subsidy Password to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Subsidy Password from memory before moving on to harder problems.

Reference excerpt

The term, Subsidy Password, is used by Motorola and other handset manufacturers to refer to the 8-digit code (or 16-digit code for phones such as the Motorola K1) unlock code necessary to remove the operator lock (also known as subsidy lock) from cell phones. This code is randomly assigned to individual cell phones by the OEM on request of the mobile service operator and prevents the use of a particular phone on a cellular network other than that for which the phone was originally sold.

Justification for use The term "subsidy" refers to the subsidization of cell phones sold to customers that purchase mobile phones as part of a contract with the mobile service operator. Many network operators provide these subsidies as an incentive for users to sign extended contracts, and use the subsidy lock as a means of protecting their investment. The installation of such locks means that users often are forced to purchase a different phone if they decide to switch their network (of advantage to both the OEM manufacturer and cellular service provider). CDMA cellular providers that use subsidy locks on their handsets: Ntelos, Cricket, Sprint, Quest, Philippines Cellular, SureWest, Telus & Bell Mobility (Not a complete list) GSM: (SIM unlock) globe smart sun Alltel or Verizon Wireless do not use any type of subsidy locks on their CDMA phones. Default Code:000000 or 123456 or 654321 Prepaid cellphones from Alltel & Verizon Wireless come locked from the store, but Verizon Wireless prepaid cellphones can be unlocked with a call to Verizon.

Unlocking services and software 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.

Legal concerns

United States Network carriers will sometimes agree to unlock their customers' phones upon request. While one could consider that the Digital Millennium Copyright Act brings the legality of such applications under question in the United States, recent legal cases such as Lexmark Int'l v. Static Control Components have confirmed that the use of software to reprogram such phones is not illegal. This is particularly true since unlocking applications increases compatibility with alternative networks, promotes positive competition and allows customers with greater freedom to use the phones that they own. In 2010, the Librarian of Congress exempted unlocking phones from the DMCA.[1]

Other countries There are no legal prohibitions to unlocking in the United Kingdom or Canada.

See also Digital Millennium Copyright Act#Anti-circumvention exemptions Mobile phone SIM lock

Worked examples

Example 1 — a first encounter with Subsidy Password

Start with the simplest possible case. Write down what Subsidy Password claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Subsidy Password before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Subsidy Password ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Subsidy Password

In research: Subsidy Password appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Subsidy Password in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Subsidy Password is common in secondary-school and first-year university syllabi. It links to neighbouring topics Consumer electronics, Mobile telecommunication services, so understanding it makes those chapters shorter.
In everyday life: Look for Subsidy Password outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Subsidy Password in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Subsidy Password means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Subsidy Password out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Subsidy Password in simple terms?

Why does Subsidy Password matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Subsidy Password?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Subsidy Password.