computer science

Just Mobile

Just Mobile is a computer 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 Just Mobile rather than just read about it. In short: Just Mobile (stylised as JUST Mobile) was a prepay mobile virtual network operator in Ireland which operated on the Vodafone Ireland network. It was founded in October 2010 and ceased operating 10 months later, in August 2011.

Key takeaways

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

Reference excerpt

Just Mobile (stylised as JUST Mobile) was a prepay mobile virtual network operator in Ireland which operated on the Vodafone Ireland network. It was founded in October 2010 and ceased operating 10 months later, in August 2011.

History Founded by Donal Lawless and Stuart Kelly, the company was funded by the founders and a BES fund managed by Powerscourt Capital Partners, an investment firm led by Irish entrepreneur Seán Melly. Melly was also chairman of Just Mobile. The company was incorporated in 2007, and launched to customers in October 2010. Upon launch, it created approximately 25 jobs, with plans to create up to 70 jobs in its first two years. Under its Just Cause scheme, the company made charitable donations of 5% of the value of every top-up.

Closure In August 2011, the company announced that it had failed to acquire the required funding to continue operating. On 2 August 2011, the Commission for Communications Regulation announced that Just Mobile would cease operations gradually, until final closure on 19 August 2011.

References

Illustrations

Worked examples

Example 1 — a first encounter with Just Mobile

Start with the simplest possible case. Write down what Just Mobile claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer 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 Just Mobile 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 Just Mobile 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 Just Mobile

In research: Just Mobile appears in computer 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 Just Mobile 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: Just Mobile is common in secondary-school and first-year university syllabi. It links to neighbouring topics Mobile virtual network operators, Telecommunications companies of the Republic of Ireland, Telecommunications in the Republic of Ireland, so understanding it makes those chapters shorter.
In everyday life: Look for Just Mobile 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 Just Mobile in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Just Mobile 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 Just Mobile out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Just Mobile in simple terms?

Why does Just Mobile matter?

Because it connects several computer 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 Just Mobile?

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 Just Mobile.