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The line graph illustrates the average monthly cost of four mobile phone contracts in a European nation over the 9-month period from January to September 2012.

Overall, Domo was consistently the most expensive contract for most of the period, while Alpha saw the most dramatic growth and became the priciest option by the end of the timeframe. Sim TX, by contrast, was the only contract that became cheaper over the months.

In January, Domo contracts cost £15 monthly, and this figure rose gradually to a peak of £25 in July before dipping slightly to £23 by September. Lex contracts also increased, from around £12 initially to £18 in September, though they had a small dip to £10 in February.

Alpha contracts were the cheapest for the first half of 2012, starting at £5 and remaining below £7 until June. They then soared sharply to reach £25 in September, matching Domo’s July peak and surpassing the other two providers. Sim TX, after a small rise to £14 in June, fell steadily to end at just over £8 in September, making it the most affordable option by the end of the period.